11. 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
12. What happens to the inductance when the magnetic field strength decreases?
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
13. What happens to the inductance when the current in the coil becomes double its original value?
A. Becomes half
B. Becomes four times
C. Becomes double
D. Remains same
14. When the coil is wrapped around a ferromagnetic core, why is it difficult to determine the inductance?
A. The variation of flux is no longer proportional to the variation of current
B. Current does not exist in the coil
C. Flux does not exist in the coil
D. The value of the current is too large to measure
15. What happens to the inductance as the area of the cross-section of the coil increases?
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
16. What happens to the inductance as the length of the magnetic circuit increases?
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
17. If the current changes from 20A to 10A in 5 seconds and the value of inductance is 1H, calculate the emf induced.
A. 8V
B. 6V
C. 4V
D. 2V
18. When a ferromagnetic core is inserted into an inductor, what happens to the flux linkage?
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
19. What happens to the current when a ferromagnetic material is introduced within an inductor?
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
20. What is the relation between the flux and the magnetizing current when a ferromagnetic core is introduced within the inductor?
A. Directly proportional
B. Inversely proportional
C. Not proportional
D. Current is double of flux