Electromagnetic induction
A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage?

0.5 s
None of the listed here
0.2 s
0.1 s

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Electromagnetic induction
An open coil has

Infinite resistance and zero inductance
Infinite resistance and normal inductance
Zero resistance and high inductance
Zero resistance and inductance

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