---

1. A circular coil is placed near a straight conductor as shown below. When the current in the straight conductor increases, the current in the coil is

A. clockwise B. anticlockwise C. normal to the plane of coil D. None of them

---

2. Which of the following gives the direction of the induced e.m.f.?

A. Faraday’s law B. Lenz’s law C. Ampere D. Biot-Savart’s law

---

3. Which of the following is based on the law of conservation of energy?

A. Faraday’s law B. Lenz’s law C. Ampere D. Biot-Savart’s law

---

4. The electric current in a circuit varies from +2A to –2A in a time 10⁻² s. Another coil of resistance 20 Ω and inductance 2H is placed near it. What will be the induced current in the second coil?

A. 4A B. 8A C. 20A D. 40A

---

5. Which of the following instruments do not make use of eddy currents?

A. Electrical brakes B. Dead beat galvanometer C. Induction motor D. Transformer

---

6. The motional e.m.f. is the induced e.m.f.

A. in a circuit due to variation in its own current B. in a circuit due to variation of current in the neighbouring circuit C. in a coil due to the motion of the magnet near it D. across the ends of a wire moving in a magnetic field

---

7. What voltage is developed across the axle of the wheels of a train, when it moves with a speed of 72 km/h? The horizontal component of earth’s magnetic field is 0.40 × 10⁻⁴ T and the angle of dip is 30°. The length of the axle is 1.5 m.

A. 0.8 mV B. 0.4 mV C. 0.2 mV D. 0.7 mV

---

8. When the current through a solenoid increases at a constant rate, the induced current:

A. is a constant and is in the direction of inducing current B. is a constant and is opposite to the direction of the inducing current C. increases with time and is in the direction of the inducing current D. increases with time and is opposite to the direction of the inducing current

---

9. Which of the following is/are equal to Henry?

A. Volt second/ampere B. Volt (second)²/coulomb C. Joule (second)²/(coulomb)² D. All of these

---

10. A coil of metal wire is kept stationary in a non-uniform magnetic field:

A. An e.m.f. and current both are induced in the coil B. An e.m.f. but not the current is induced in the coil C. Current but not the e.m.f is induced in the coil D. Neither e.m.f. nor current is induced in the coil

---

11. Two different coils have self-inductances L₁ = 8 mH, L₂ = 2 mH. The current in one coil is increased at a constant rate. The current in the second coil is also increased at the same constant rate. At a certain instant of time, the power given to the two coils is the same. At that time, the current, the induced voltage and energy stored in the two coils are I₁, V₁, U₁, and I₂, V₂, U₂ respectively.

A. V₂/V₁ = 1/4 B. I₁/I₂ = 1/4 C. U₂/U₁ = 4 D. All of the Above

---

12. Induced e.m.f. produced in a coil rotating in a magnetic field will be maximum when the angle between the axis of coil and direction of magnetic field is:

A. 90° B. 45° C. 0° D. 180°

---

13. A copper rod moves parallel to the horizontal direction. The induced e.m.f. developed across its ends due to earth’s magnetic field will be maximum at the:

A. poles B. equator C. latitude 30° D. latitude 60°

---

14. A coil having 500 square loops each of side 10 cm is placed normal to the magnetic field which increases at a rate of 1.0 Wb/s. The induced e.m.f. is:

A. 0.1V B. 5V C. 0.5V D. 1.0V

---

15. When current I is passed through an inductor of coefficient of self-induction L, energy stored in it is ½ LI². This energy stored is in the form of:

A. Voltage B. Current C. Magnetic field D. Electric field

---

16. Whenever the magnetic flux linked with an electric circuit changes, an emf is induced in the circuit. This is called

A. electromagnetic induction B. Lenz’s law C. hysteresis loss D. Kirchhoff’s laws

---

17. In electromagnetic induction, the induced charge is independent of

A. change of flux B. time C. resistance of the coil D. None of these

---

18. An induced e.m.f. is produced when a magnet is plunged into a coil. The strength of the induced e.m.f. is independent of

A. the strength of the magnet B. number of turns of coil C. the resistivity of the wire of the coil D. speed with which the magnet is moved

---

19. According to Faraday’s law of electromagnetic induction

A. electric field is produced by time varying magnetic flux B. magnetic field is produced by time varying electric flux C. magnetic field is associated with a moving charge D. None of these

---

20. A moving conductor coil produces an induced e.m.f. This is in accordance with

A. Lenz’s law B. Faraday’s law C. Coulomb’s law D. Ampere’s law