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A conducting rod is rotated in a plane perpendicular to a uniform magnetic field with constant angular velocity. The correct graph between the induced emf across the rod and time is
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Important Questions on Electromagnetic Induction
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Charge is uniformly spread on a thin ring of radius . The ring rotates about its axis with a uniform frequency . The magnitude of magnetic induction at the centre of the ring is
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A small magnet is along the axis of a coil and its distance from the coil is . In this position the flux linked with the coil is turns . If the coil is displaced towards the magnet in , then the induced emf produced in the coil will be
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The magnetic flux in a closed circuit of resistance varies with time as . The current in the loop will change its direction after a time of
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When the current in a certain inductor coil is and is increasing at the rate of , the potential difference across the coil is . When the current is and decreasing at the rate of , the potential difference is . The self inductance of the coil 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 is
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A superconducting loop of radius has self inductance . A uniform and constant magnetic field is applied perpendicular to the plane of the loop. Initially current in this loop is zero. The loop is rotated by The current in the loop after rotation is equal to-
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A generator has an of and internal resistance of . Its terminals are connected to a load of . The voltage across the load is
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A circular coil has radius . It is kept in a magnetic field acting normal to the area of the coil. The magnetic field is increased from to in . The average induced emf in the coil is
