Question

QUESTION 1 A current of 3t^2 flows through a 100 mH inductor. What is the emf...

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 Ns>Np 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

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