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In , the current in a coil increases from to . If the inductance of the coil is , then induced current in external resistance of will be___
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Important Questions on Electromagnetic Induction
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In the circuit shown in figure what is the value of Il just after pressing the key K ?
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Pure inductors each of inductance 3 H are connected as shown. The equivalent induction of the circuit is :-
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The time constant of an inductance coil is . When a resistance is joined in series, the time constant becomes . The inductance and resistance of the coil are
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A toroidal solenoid with an air core has an average radius of 15 cm, area of cross-section 12cm2 and 1200 turns. Ignoring the field variation across the cross-section of the toroid, the self-inductance of the toroid is :-
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A cylindrical iron core supports N turns. If a current I produces a magnetic flux across the core’s cross section, then the magnetic energy is :-
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An inductance and a resistance are first connected to a battery. After some time the battery is disconnected but and remain connected in a closed circuit. Then the current reduces to of its initial value in
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Energy is stored in the choke coil in the form of-
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When a current changes from 2A to 4A in 0.05 sec. in a coil, induced emf is 8 V. The self inductance of coil is :-
