The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as
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Electrical Engineering · all questionsElectromagnetic Induction
Electromagnetic Induction
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Which circuit element(s) will oppose the change in circuit current?
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Which of the following circuit elements will oppose the change in circuit current?
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In case all the flux from the current in coil 1 links with coil 2, the coefficient of coupling will be
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Two 300 uH coils in series without mutual coupling have a total inductance of
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Which of the following is not a unit of inductance?
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Which of the following is unit of inductance?
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An open coil has
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The self inductances of two coils are 8 mH and 18 mH. If the coefficient of coupling is 0.5, the mutual inductance of the coils is
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Reversing the field or the current will reverse the force on the conductor.
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Increasing the field or increasing the current will decrease the force on the conductor.
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A moving magnetic field will produce the same effect as a conductor that is moving.
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Which of the fpllowing inductor will have the least eddy current losses ?
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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?
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A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is
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For a purely inductive circuit which of the following is true?
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The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be
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A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be
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An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be
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Which of the following circuit element stores energy in the electromagnetic field?
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