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General
Easy
Question
An ac supply gives 30 V r.m.s. which passes through a 10
resistance. The power dissipated in it is
The correct answer is:
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A straight wire of length L is bent into a semicircle. It is moved in a uniform magnetic field with speed v with diameter perpendicular to the field. The induced emf between the ends of the wire is
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A conducting loop having a capacitor is moving outward from the magnetic field then which plate of the capacitor will be positive
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A square coil ABCD lying in x-y plane with it’s centre at origin. A long straight wire passing through origin carries a current i = 2t in negative z-direction. The induced current in the coil is
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The figure shows four wire loops, with edge lengths of either L or 2L. All four loops will move through a region of uniform magnetic field 
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Assertion : The induced emf in a conducting loop of wire will be non zero when it rotates in a uniform magnetic field.
Reason : The emf is induced due to change in magnetic flux.
Assertion : The induced emf in a conducting loop of wire will be non zero when it rotates in a uniform magnetic field.
Reason : The emf is induced due to change in magnetic flux.
Physics-General
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A magnet is made to oscillate with a particular frequency, passing through a coil as shown in figure. The time variation of the magnitude of e.m.f. generated across the coil during one cycle is
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