Magnetic Effects of Electric Current | CBSE | Class 10 | Physics | Solutions

CBSE | Class 10 | Physics | Solutions
Chapter 13
Magnetic Effects of Electric Current

Free NCERT Solutions for CBSE Class 10 physics are available here to download in PDF. Detailed and appropriate NCERT solutions will help to enhance your problem solving skills and get the desired results in your board examinations.

Page No 224:

Question:

1. Why does a compass needle get deflected when brought near a bar magnet?

Solution:

Page No 228:

Questions:

1. Draw magnetic field lines around a bar magnet.

2. List the properties of magnetic lines of force.

3. Why don’t two magnetic lines of force intersect each other?

Solution:

Page No 229:

Questions:

1. Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.

2. The magnetic field in a given region is uniform. Draw a diagram to represent it.

3. Choose the correct option. The magnetic field inside a long straight solenoid-carrying current

(a) is zero.

(b) decreases as we move towards its end.

(c) increases as we move towards its end.

(d) is the same at all points.

Solutions:

Page No 231:

Questions:

1. Which of the following property of a proton can change while it moves freely in a magnetic field? (There may be more than one correct answer.)

(a) mass         (b) speed

(c) velocity    (d) momentum

2. In Activity 13.7, how do we think the displacement of rod AB will be affected if (i) current in rod AB is increased; (ii) a stronger horse-shoe magnet is used; and (iii) length of the rod AB is increased?

3. A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is

(a) towards south (b) towards east

(c) downward (d) upward

Solutions:

Page No 233:

Questions:

1. State Fleming’s left-hand rule.

2. What is the principle of an electric motor?

3. What is the role of the split ring in an electric motor?

Solutions:

Page No 236:

Question:

1. Explain different ways to induce current in a coil.

Solution:

Page No 237:

Questions:

1. State the principle of an electric generator.

2. Name some sources of direct current.

3. Which sources produce alternating current?

4. Choose the correct option. A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each

(a) two revolutions     (b) one revolution

(c) half revolution      (d) one-fourth revolution

Solutions:

Page No 238:

Questions:

1. Name two safety measures commonly used in electric circuits and appliances.

2. An electric oven of 2 kW power rating is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain.

3. What precaution should be taken to avoid the overloading of domestic electric circuits?

Solutions:

  Textbook Questions  

1. Which of the following correctly describes the magnetic field near a long straight wire?

(a) The field consists of straight lines perpendicular to the wire.

(b) The field consists of straight lines parallel to the wire.

(c) The field consists of radial lines originating from the wire.

(d) The field consists of concentric circles centred on the wire.

2. The phenomenon of electromagnetic induction is

(a) the process of charging a body.

(b) the process of generating magnetic field due to a current passing through a coil.

(c) producing induced current in a coil due to relative motion between a magnet and the coil.

(d) the process of rotating a coil of an electric motor.

3. The device used for producing electric current is called a

(a) generator.

(b) galvanometer.

(c) ammeter.

(d) motor.

4. The essential difference between an AC generator and a DC generator is that

(a) AC generator has an electromagnet while a DC generator has permanent magnet.

(b) DC generator will generate a higher voltage.

(c) AC generator will generate a higher voltage.

(d) AC generator has slip rings while the DC generator has a commutator.

5. At the time of short circuit, the current in the circuit

(a) reduces substantially.

(b) does not change.

(c) increases heavily.

(d) vary continuously.

6. State whether the following statements are true or false.

(a) An electric motor converts mechanical energy into electrical energy.

(b) An electric generator works on the principle of electromagnetic induction.

(c) The field at the centre of a long circular coil carrying current will be parallel straight lines.

(d) A wire with a green insulation is usually the live wire of an electric supply.

Solution from Que 1 to 6:

7. List three sources of magnetic fields.

8. How does a solenoid behave like a magnet? Can you determine the north and south poles of a current–carrying solenoid with the help of a bar magnet? Explain.

Solution from Que 7 to 8:

9. When is the force experienced by a current–carrying conductor placed in a magnetic field largest?

10. Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field?

Solution from Que 9 to 10:

11. Draw a labelled diagram of an electric motor. Explain its principle and working. What is the function of a split ring in an electric motor?

Solution of Que 11:

12. Name some devices in which electric motors are used.

13. A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (i) pushed into the coil, (ii) withdrawn from inside the coil, (iii) held stationary inside the coil?

14. Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.

Solution from Que 12 to 14:

15. State the rule to determine the direction of a (i) magnetic field produced around a straight conductor-carrying current, (ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and (iii) current induced in a coil due to its rotation in a magnetic field.

16. Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of brushes?

Solution from Que 15 to 16:

17. When does an electric short circuit occur?

18. What is the function of an earth wire? Why is it necessary to earth metallic appliances?

Solution from Que 17 to 18:

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