Question

QUESTION 1

1. A current of 3t^2 flows through a 100 mH inductor. What is the emf across the conductor at t=2s?

   		1.2 V
   		-1.2 V
   		-120 V
   		120 V

QUESTION 2

1. What is the energy stored in a 50 mH inductor if a 20 A current is applied?

   		10 J
   		0.5 J
   		5 J
   		1 J

QUESTION 3

1. A transformer is made using a primary coil with N=100 turns and a secondary coil with N=25 turns. What is the voltage of the second coil if 100 V is applied to the first coil.

   		400 V
   		25 V
   		40 V
   		2.5 V

  

QUESTION 4

1. A transformer constructed so that N_s>N_p is a:

   		Step up transformer
   		Step down transformer
   		Neither

  

QUESTION 5

1. A solenoid with a length of 50cm and N=100 has a current of 5 A applied. What is the magnetic energy density?

   		500 T/m2
   		1.25 T/m2
   		0.63 T/m2
   		1.59 T/m2

Answer 1