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Electromagnetic induction

Electromagnetic induction
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

9 H
6 H
12 H
10 H

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Electromagnetic induction
A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is

500 ohms
100 ohms
1000 ohms
5000 ohms

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Electromagnetic induction
A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be

12 mH
48 mH
24 mH
6 mH

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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

1000 N
400 N
100 N
300 N

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

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

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Electromagnetic induction
The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will

3 mH
28 mH
24 mH
12 mH

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