Question

1. A long solenoid with a diameter of 10 cm has 200 turns/cm. If the current...

1. A long solenoid with a diameter of 10 cm has 200 turns/cm. If the current is decreased at a rate of 3 mA/s, what is the magnitude of the induced electric field (in mV/m), 6 cm from the axis of the solenoid?

A. 0.2
B. 0.1
C. 0.3
D. 0.4

2.

A series RL circuit with R = 40 Ω and L = 10 H has a constant voltage V = 100 V applied at t = 0 by closing of a switch. Find the current (in A) at t = 0.5 s.

A. 4.32
B. 1.44
C. 6.48
D. 2.16

3.

The inductance of a close-packed coil of 400 turns is 80 mH. Calculate the magnetic flux (in mT·m2) through the coil when the current is 2.5 A.

A. 2.5
B. 1.5
C. 0.5
D. 1.2

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Answer #1

I think in this question given answers could be wrong. And the correct answer will be 0.002 mV/m.

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