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The co-efficient of coupling between two air core coils depends on____________?

A. Self-inductance of two coils only
B. Mutual inductance between two coils only
C. Mutual inductance and self inductance of two coils
D. None of the above

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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___________?

A. 5 mh
B. 10 mh
C. 5 h
D. 10 h

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A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is___________?

A. 3500 mh
B. 350 mh
C. 250 mh
D. 150 mh

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Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla

A. 100 n
B. 400 n
C. 600 n
D. 1000 n

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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____________?

A. 20 wb
B. 2 wb
C. 0.2 wb
D. 0.02 wb

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Two 300 uH coils in series without mutual coupling have a total inductance of___________?

A. 300 uh
B. 600 uh
C. 150 uh
D. 75 uh

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Which of the fpllowing inductor will have the least eddy current losses ?

A. Air core
B. Laminated iron core
C. Iron core
D. Powdered iron core

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A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?

A. 0.01 s
B. 0.1 s
C. 0.5 s
D. 5 s

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A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is_____________?

A. 50 ohms
B. 500 ohms
C. 1000 ohms
D. 5000 ohms

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A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly______________?

A. 50 n
B. 120 n
C. 240 n
D. 480 n

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