Electronic Principles
A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns?

0.41666666666667
1000 A
0.1 A
None of these
100 A

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Electronic Principles
A farad is defined as the amount of capacitance necessary for:

dissipating 1 W of power
None of these
changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
storing 1 V for 1 second
causing an ac phase shift greater than 90 degree

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Electronic Principles
In a pure inductor:

None of these
ac current and voltage are exactly in phase
ac current is converted to dc voltage
ac current lags the voltage by 90 degree
ac current leads the voltage by 90 degree

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