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The current in a 90mH inductor changes w...

The current in a 90mH inductor changes with time as `i=1.0t^2-6t`, where I is in amperes and t is in seconds.

A

the magnitude of the induced emf at t=4.0s is 180 mV

B

the emf zero at time t=3.0s

C

the magnitude of the induced emf at t=4.0s is 360 mV

D

the emf zero at time t=4.0s

Text Solution

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The correct Answer is:
A, B
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Knowledge Check

  • The current in a wire varies with time according to the equation l=4+2t, where l is in ampere and t is in sec. the quantity of charge which has passed through a cross-section of the wire during the time t=2 sec to t=6 sec will be

    A
    40C
    B
    48C
    C
    38C
    D
    43C