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A metallic ring is dropped down, keeping its plane perpendicular to a constant and horizontal magnetic field. The ring enters the region of magnetic field at and completely emerges out at . The current in the ring varies as
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Important Questions on Electromagnetic Induction
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A circular disc of radius is placed in a uniform magnetic field of induction in such a way that its axis makes an angle of with . The magnetic flux linked with the disc is:
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A long solenoid has turns. When a current of is passed through it, the resulting magnetic flux linked with each turn of the solenoid is Wb. The self-inductance of the solenoid is
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A conducting circular loop is placed in a uniform magnetic field, with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of . The induced e.m.f. when the radius is 2 cm is
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A coil of resistance is placed in a magnetic field. If the magnetic flux linked with the coil varies with time as The current in the coil at sec is :
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The current (I) in the inductor is varying with time according to the plot shown in figure.
Which one of the following is the correct variation of voltage with time in the coil ?
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In a coil of resistance , the induced current developed by changing magnetic flux through it, is shown in figure as a function of time. The magnitude of change in flux through the coil in Weber is
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A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is
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The time constant of a circuit is , when a resistance of is connected in series in a previous circuit then time constant becomes 2 second, then the self inductance of the circuit is:-
