Electronic Principles
The core of an electromagnet is said to be in saturation when:

frequent changes in the direction of current through the coil causes heating effects in the core material
an increase in current through the coil causes no further increase in the mmf
the core is permitted to move freely within the coil
None of these
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core

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

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

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

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
dissipating 1 W of power
None of these

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