MEDIUM
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IMPORTANT
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An aluminium ring B faces an electromagnet A. The current I through A can be altered. Then which of the following statement is correct :-
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Important Questions on Electromagnetic Induction
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A charge particle moves along the line AB, which lies in the same plane of a circular loop of conducting wire as shown in the fig. Then :-
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IMPORTANT
The magnetic flux through a circuit of resistance R changes by an amount in a time . The total quantity of electric charge Q that passes any point in the circuit during the time At is represented by:-
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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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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
HARD
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IMPORTANT
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?
HARD
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IMPORTANT
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
