Electronic Principles
One henry of inductance is defined as:

the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second
the amount of inductance required to change the frequency of a current by 1 Hz
the number of turns of wire in an inductor multiplied by the amount of current flowing through it
None of these
the amount of counter emf required to reduce a current to 1 A

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Electronic Principles
Which one of the following statements is true for the voltage in a parallel RL circuit?

None of these
The total voltages is less than the sum of the voltages across the resistance and inductance
The total voltage lags the total current by less than 90
The total voltage is equal to the sum of the voltages across the resistance and inductance
The voltage always has the same amplitude and phase for every part of the circuit

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Electronic Principles
The dielectric constant of a material is a measure of:

None of these
the amount of voltage it can withstand before breaking down
the amount of opposition to the current flow
how well the material concentrates electrostatic lines of force
how well the material concentrates magnetic lines of force

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