PhysicsAdvancedHigh School (11–12)Electricity & Magnetism › Electromagnetic InductionJEE MainNEETAEEE (Amrita)AMUEEEAP EAPCETBCECE
Created by StemPy LabThe graph in the figure shows the magnetic flux through a coil of resistance as time passes. The flux is positive when it points one way through the coil and negative when it points the other way. The coil has no other source of emf. Which description of the induced current is correct?
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← Six statements about electromagnetic induction are given. (i) A loop moving at constant velocity, wholly inside a uniform field, has no induced current. (ii) The induced emf in a loop depends on its resistance. (iii) The charge flowing round a loop is ΔΦ/R, whatever the time the flux takes to change. (iv) Eddy currents form only in wire loops, never in solid blocks. (v) Laminating a transformer core reduces eddy currents. (vi) Lenz's law follows from conservation of charge. How many of the statements above are correct?A long air-cored solenoid has N turns, length l and area A. Six statements about changes follow. (i) Doubling N makes the self-inductance L four times as large. (ii) Doubling the radius makes L twice as large. (iii) Doubling the length, with N and A fixed, halves L. (iv) Doubling the current doubles the stored energy. (v) A short iron core in its middle multiplies L by µr. (vi) L depends on the current in an air-cored solenoid. How many of the statements above are correct? →
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