APFIVE Inductor Energy and Induced EMF
A solenoid with inductance L carries a current I that is decreasing at a rate of 50 A/s. At the instant the current is I, the energy stored in the magnetic field is 0.3 J. What is the magnitude of the induced emf in the solenoid?
A
15 V
B
0.6 V
C
30 V
D
$$\frac{30}{I^2}\ \text{V}$$
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