11. Among the following, which is the right formula for inductance?

A. L = emf × t/I

B. L = emf/t × I

C. L = emf × I/t

D. L = emf × t × I

12. Among the following, which is the right formula for the inductance of N turns?

A. L = et/Ni

B. L = N × i × e × t

C. L = Ni/et

D. L = N/iet

13. For a coil having a magnetic circuit of constant reluctance, the flux is ___________ to the current.

A. Directly proportional

B. Inversely proportional

C. Not related

D. Very large compared to

14. For a coil having a magnetic circuit of constant reluctance, if the flux increases, what happens to the current?

A. Increases

B. Decreases

C. Remains constant

D. Becomes zero

15. The unit for inductance is ___________

A. Ohm

B. Henry

C. A/m

D. A/s

16. If either the inductance or the rate of change of current is doubled, the induced e.m.f?

A. Remains constant

B. Becomes zero

C. Doubles

D. Becomes half

17. If the current changes from 5A to 3A in 2 seconds and the inductance is 10H, calculate the emf.

A. 5V

B. 10V

C. 15V

D. 20V

18. If the current changes from 5A to 3A in x sec and inductance is 10H. The emf is 10V, calculate the value of x.

A. 2s

B. 3s

C. 4s

D. 5s

19. If the current changes from 3A to 5A in 2s and the emf is 10V. Calculate the inductance.

A. 10H

B. 20H

C. 30H

D. 40H

20. As the number of turns in the coil increases, what happens to the inductance of the coil?

A. Increases

B. Decreases

C. Remains the same

D. Becomes zero