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Ncert Maths Class 10 Chapter 13 3 In Hindi Chapter 10 - Gravitation. Chapter 11 - Work and Energy. Chapter 12 - Sound. Chapter 13 - Why do We Fall ill. Chapter 14 - Natural Resources Chapter 15 - Improvement in Food Resources. The NCERT Solutions for Class 9 Science Chapter 3 on Vedantu can be accessed by students online and can also be downloaded for free. Oct 01, �� Important Question for Class 10 Science Magnetic Effects of Electric Current PDF will help you in scoring more marks.. This consists of 1 mark Questions, 3 Mark Numericals Questions, 5 Marks Numerical Questions and previous year questions from Magnetic Effects of Electric Current . Apr 22, �� NCERT Exemplar Class 12 Chemistry is very important resource for students preparing for XII Board Examination. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class Question from very important topics are covered by NCERT Exemplar Class You also get idea about the type of questions and method to answer in your class .
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Why is an earth wire connected to metallic parts of appliances? For earth wire, green or yellow colour insulation is used. The earth wire provides the low resistance conducting path for the current and maintains the potential of appliances body with that of the earth. So, earth wire is used as a safety measure. Identify the poles of the magnet in the given figure 1 and 2. Field lines emerge from north pole N and merge at the south pole S as shown in both the figures.

Explain the role of fuse in series with any electrical appliance in an electric circuit. Why should a fuse with defined rating for an electric circuit not be replaced by one with a larger rating?

Fuse is a safety device connected in series with live wire or with any electrical appliance in an electric circuit.

High rating fuse wire has the larger capacity. So, it will not stop the flow of any relatively high current. Therefore, electrical devices cannot be protected from the possible damage. The magnetic field associated with a current-carrying straight conductor is in anticlockwise direction. If the conductor was held along the east-west direction, what will be the direction of current through it?

Name and state the rule applied to determine the direction of current. Direction of current � east to west as determined by Right-hand thumb rule.

Two circular coils A and B are placed close to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason. Yes, when a current in coil A changes, magnetic field lines linked with coil B also change. Hence, due to change in number of magnetic field lines, there is an induced current in coil B.

How will the magnetic field produced at a point due to a current-carrying circular coil change if we: i increase the current flowing through the coil? Magnetic field B at the centre of the circular coil i increases if the current is increased as ii reverses on reversing the current. What force is acting on proton beam? As proton beam is moving along the direction of magnetic field. A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is a pushed into the coil, b withdrawn from inside the coil, c held stationary inside the coil?

It causes the electric current to get induced in it. The needle of galvanometer will move momentarily in one direction.

Current will be induced in the coil which will be indicated by deflection of needle in the galvanometer. The deflection is opposite to that in case a. This indicates that the direction of induced current is now opposite to the direction of induced current in case a. This is because there is no change in magnetic field lines linked with the coil. Hence, no induced current will flow through the coil.

State the rule to determine the direction of a a magnetic field produced around a straight conductor carrying current, b force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it. If we hold a current-carrying conductor in a right hand in such a way that the stretched thumb is along the direction of current, then the curly fingers around the conductor represent the direction of magnetic field lines.

Stretch the thumb, forefinger and middle finger of left hand in such a way that they are mutually perpendicular to each other. If the forefinger points to the direction of magnetic field and the middle finger points to the direction of current, then the thumb will point to the direction of motion or the force acting on the conductor.

Apparatus Required: A thick conducting wire, battery, rheostat, magnetic needle, ammeter A , key, a cardboard, a stand to hold the wire, iron filings and sprinkler of iron filings. Observation: Just on closing the key, the iron filings are aligned in the pattern of concentric circles around the wire. State the rule used to find the direction of electric current thus generated in the coil.

What will you observe in Q a if current in the coil P is changed? Connect the ends of coil to a sensitive galvanometer as shown in figure. The deflection in the needle of galvanometer indicates that the induced current flows in the circuit in anticlockwise direction.

The end A of the coil behaves as a north pole. When north pole of the magnet moves away from the coil, the deflection in the galvanometer occurs but in opposite direction. Similar observations can be made when south pole of the magnet is moved towards the coil or away from it. When magnet is kept at rest with respect to the coil, the deflection in the needle of galvanometer drops to zero.

Thus, the motion of a magnet, with respect to the coil, produces an induced potential difference which sets up an induced electric current in the circuit.

If the forefinger indicates the direction of magnetic field and thumb shows the direction of motion of the conductor, then the middle finger will indicate the direction of induced current. So, induced potential difference is set up in the coil Q. This results in induced electric current in coil Q which opposes the change in current in coil P.

Hence, no current will be induced in the coil. A charged particle enters at right angle into a uniform magnetic field as shown. What should be the nature of charge on the particle if it begins to move in a direction pointing vertically out of the page due to its interaction with the magnetic field?

A coil of insulated wire is connected to a galvanometer. What would be seen if a bar magnet with its north pole towards one face of the coil is i moved quickly towards it, ii moved quickly away from the coil and iii placed near its one face?

Name the phenomenon involved. Hi No deflection. The phenomenon involved is electromagnetic induction. Two coils A and B of insulated wires are kept close to each other. Coil A is connected to a galvanometer while coil B is connected to a battery through a key. What would happen if i a current is passed through coil B by plugging the key, and ii the current is stopped by removing the plug from the key? Explain your answer mentioning the name of the phenomenon involved. In both the given cases, galvanometer shows momentary deflection but in opposite direction.

In coil A, magnetic field lines [increased in case i and decreased in case ii ] induce a potential difference across the coil A which sets up induced electric current in coil A. It is shown by the deflection in galvanometer. This is known as electromagnetic induction. Name any two appliances which are based on the application of heating effect of electric current.

Room heater and geyser. An electric oven of 2 kW power rating is operated in a domestic electric circuit V that has a current rating of 5 A. What result do you expect? When is the force experienced by a current-carrying conductor placed in a magnetic field largest? When the length of current-carrying conductor and direction of magnetic field are perpendicular to each other, the maximum force is experienced by the current-carrying conductor.

Consider a circular loop of wire lying in the plane of Ch 3 Maths Class 10 In Hindi Amazon the paper. Let the current pass through the loop clockwise. With the help of a diagram, explain how the direction of the magnetic field can be determined inside and outside the loop. Name the law used to find the direction of magnetic field. Consider a circular loop of wire of radius r with centre O lying in the plane of the paper.

Let the current i pass through the loop clockwise. According to right hand thumb rule, direction of magnetic field due to any portion of small current carrying length of the coil is: Direction of magnetic field inside the loop � Perpendicular to the plane of paper inwards.

Direction of magnetic field outside the loop � Perpendicular to the plane of paper outwards. So, the direction of magnetic field can be considered as the direction of total magnetic field due to circular coil as current through all the elements will contribute to the magnetic field in the same direction. Procedure : Pass the coil through the two holes of cardboard in such a way that half of the loop is above the cardboard and remaining part should be below it and normal to the plane of cardboard.

Connect the circuit as shown. Sprinkle iron filings uniformly on the cardboard. Allow the current to pass though the coil by inserting plug in the key. Note the pattern of iron filings that emerges on the cardboard after tapping gently a few times. Place the compass at any point over the pattern of field. Observe the direction of needle. Observation 2. Observations : a Iron filings are arranged in the form of concentric circles.

Conclusion : The concentric circles at every point of a current carrying circular loop represent the magnetic field around it. Magnetic field line close to the axis of loop is straight and is perpendicular to the plane of the coil.

Field lines keep on diverging as we move away from the centre of loop. So Minimum � at point B; Maximum � at point A 4. Arrange the set-up as shown in figure. Plug the key, the current flowing through the rod from Q to P observe the displacement of rod. Now unplug the key and remove the first horse shoe magnet and place the second horse shoe magnet of higher magnetic field strength in a similar manner to that of first.

Plug the key, the current again flow through the rod from Q to P. Again observe the deflection of rod. Again observe the motion of rod. Procedure : Hang the aluminium rod with the help of clamp stand such that it passes between the North and South pole of the magnet with the magnetic field directed upwards and the rod being horizontal and perpendicular to the field. Connect the aluminium rod in series with a battery, a key as shown in figure. Plug the key, the current flows through the rod from Q to P and observe the direction of motion of the rod.

Reverse the direction of current by reversing the battery connection. Again observe the direction of displacement of aluminium rod. Restore the original direction of current and change the direction of field vertically downwards by interchanging the two poles of the magnet.

Observe the deflection of rod again. Place the wire parallel to magnetic field and allow the current to pass through it. Check the deflection of rod again. Observation : On plugging the key in step 3, the aluminium rod moves towards left. In step 4, rod displaces towards right. In step 5, rod moves towards right again.

In step 6, rod does not move in any direction. Conclusion : Magnetic field exerts a force on a current carrying conductor. The force exerted on the current carrying conductor depends upon the direction of current and direction of magnetic field acting on it. Displacement of the rod or the magnetic force on it is largest when the direction of current is at right angle to the direction of magnetic field.

When current carrying conductor is placed parallel to the magnetic field, it experiences no force. If the forefinger points in the direction of magnetic field and the middle finger in the direction of current, then the thumb will point in the direction of motion or the force acting on the conductor. Frequency of Alternating current is equal to the number of cycles completed in one second.

In India, frequency of AC is 50 Hz i. An alternating current is considered to be advantageous over direct current for long range transmission of electric energy because it can be transmitted over long distances to distant places without much loss of electric power as compared to direct current. When this happens, there is an excessive electric current which can damage the circuit and may also cause electrical fires.

Procedure : Attach the thick wire through a hole at the middle of the cardboard and clamp it in a stand. Attach the ends of the wire through a key, variable resistor and an ammeter on either side of a battery and hold it vertically and perpendicularly to the board. Spread the iron filings uniformly on the cardboard and place the magnetic needle on the board. Close the key and tap the cardboard slightly and observe the orientation of iron filings. Observation : Just on closing the key, the iron filings are aligned in the pattern of concentric circles around the wire.

Conclusion : Current carrying conductor is a source of magnetic field. The magnetic field is in the form of concentric circles whose centre lies on the wire. This rule is used to find the direction of magnetic field due to a straight current carrying wire.

It states that if we hold the current carrying-conductor in the right hand in such a way that the thumb is stretched along the direction of current, then the curly finger around the conductor represent the direction of magnetic field produced by it.

This is known as right-hand thumb rule. Direction of Field Lines due to current carrying straight conductor is as shown in figure. Procedure: Insert the two nails vertically on the card board. Take very thin aluminium strip and tie it between the nails. The litmus paper is kept very close to the mouth of the delivery tube.

Which of the following phenomena occur, when a small amount of acid is added to water? Ionisation ii. Neutralisation iii. Dilution iv. Salt formation. Which of the following indicators turn red in an acidic solution? Phenolphthalein ii. Litmus iii. Turmeric iv. Methyl orange. Dilute acid does not produce carbon dioxide on being treated with: a. Marble b. Lime c. Baking soda d.

The sample of soil from a particular place was tested for its pH value. It came out to be 5. Which one of the following should be added to the soil to make it suitable for the plant growth?

Calcium chloride ii. Calcium Hydroxide iii. Calcium oxide. Calcium hydrogencarbonate and chlorine gas b. Calcium chloride and water c. Calcium oxide, carbon dioxide and water d. Calcium chloride, carbon dioxide and water. Choose the correct option from the following to be filled in the blank space: a. Methanoic acid b. Caustic soda. Bleaching powder is used as a disinfectant for water to: a. Make water tastier b. Remove all the dirt from water c. Make water germ-free d. Make water clear.

Which one of the following salts will dissolve in water to form an alkaline solution? Potassium carbonate b.

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