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If number of turns of 70cm2 coil is 200 and it is placed in a magnetic field of 0.8 Wb/m2 which is perpendicular to the plane of coil and it is rotated through an angle 180º in 0.1 sec, then induced emf in coil :-
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Important Questions on Electromagnetic Induction
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A circular loop of radius r is placed in a region where magnetic field increases with respect to time as B(t) = at, then induced emf in coil :-
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A circular loop of radius r is moved away from a current carrying wire then induced current in circular loop will be :-
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When the current through a solenoid increases at a constant rate, the induced current
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A solenoid of inductance and resistance is connected to a battery. In how much time the magnetic energy will increase to one-fourth of its maximum value?
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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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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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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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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
