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Electromagnetic induction

Electromagnetic induction
The self inductances of two coils are 8 mH and 18 mH. If the coefficient of coupling is 0.5, the mutual inductance of the coils is

36 mH
6 mH
12 mH
18 mH

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Electromagnetic induction
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

48 mH
38 mH
30 mH
36 mH

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Electromagnetic induction
In case of an inductance, current is proportional to

None of the listed here
Magnetic field
Both of the listed here
Voltage across the inductance

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Electromagnetic induction
The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns.

Yes
No

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Electromagnetic induction
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

100 N
1000 N
400 N
300 N

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Electromagnetic induction
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

20 wb
2 wb
0.2 wb
0.02 wb

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