EXAMIANS
The law that the induced e.m.f. and current always oppose the cause producing them is due to
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The coefficient of coupling between two air core coils depends on
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Reversing the field or the current will reverse the force on the conductor.
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Two coils have inductances of 8 mH and 18 mH and a coefficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be
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An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is
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Air-core coils are practically free from
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Which of the following inductor will have the least eddy current losses?
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A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be
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Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be
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Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is
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