HARD
NEET
IMPORTANT
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An inductance coil has a time constant of . If it is cut into two equal parts and connected in parallel, then, the new time constant of the circuit will be
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Important Questions on Electromagnetic Induction
MEDIUM
NEET
IMPORTANT
If a current of 2A give rise a magnetic flux of 5 × 10–5 weber/turn through a coil having 100 turns, then the magnetic energy stored in the medium surrounding by the coil is :-
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IMPORTANT
For a solenoid, keeping its turn density constant, if its length is halved and its cross-sectional radius is doubled, then, the inductance of the solenoid increases by
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IMPORTANT
A constant current i maintained in a solenoid. Which of the following quantities will increase if an iron rod is inserted in the solenoid along its axis:-
(a) Magnetic field at the centre
(b) Magnetic flux linked with the solenoid
(c) Self inductance of the solenoid
(d) Rate of Joule heating
HARD
NEET
IMPORTANT
The inductance of a solenoid is and its resistance is . If it is connected to a battery, then time taken by the current to reach of its maximum, will be
MEDIUM
NEET
IMPORTANT
An LR circuit with a battery is connected at t = 0. Which of the following quantities is not zero just after the connection :-
(a) Current in circuit
(b) Magnetic potential energy in the inductor
(c) Power delivered by the battery
(d) Emf induced in the inductor
EASY
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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
In the circuit shown in figure what is the value of Il just after pressing the key K ?
EASY
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IMPORTANT
Pure inductors each of inductance 3 H are connected as shown. The equivalent induction of the circuit is :-
