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Question
In an ac circuit, the r.m.s. value of current, Irms is related to the peak current, I0 by the relation
The correct answer is:
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An ac supply gives 30 V r.m.s. which passes through a 10
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The r.m.s. value of an ac of 50 Hz is 10 amp. The time taken by the alternating current in reaching from zero to maximum value and the peak value of current will be
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The magnetic field in the cylindrical region shown in figure increases at a constant rate of 20 mT/sec. Each side of the square loop ABCD has a length of 1 cm and resistance of 4. Find the current in the wire AB if the switch S is closed
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A pair of parallel conducting rails lie at right angle to a uniform magnetic field of 2.0 T as shown in the fig. Two resistors 10 W and 5 are to slide without friction along the rail. The distance between the conducting rails is 0.1 m. Then
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Two coils P and Q are placed co-axially and carry current I and I' respectively
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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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In which of the following circuit is the current maximum just after the switch S is closed
In which of the following circuit is the current maximum just after the switch S is closed
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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.
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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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