EXAMIANS
An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is
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The voltage across a coil when di/dt = 20 mA/s and L = 8 H is
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Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?
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The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is
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When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field
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A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?
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A 320 H coil is in series with a 3.3 k resistor. How long does it take for current to build up to its full value?
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The winding resistance of a coil can be increased by
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The inductance of an iron-core coil decreases if
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A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current
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