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Electromagnetic induction

Electromagnetic induction
Which of the following circuit element stores energy in the electromagnetic field?

Variable resistor
Resistance
Condenser
Inductance

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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

12 mH
24 mH
3 mH
28 mH

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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

12 mH
6 mH
18 mH
36 mH

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Electromagnetic induction
Mutually inductance between two magnetically coupled coils depends on

All of the listed here
Permeability of the core
Cross-sectional area of their common core
The number of their turns

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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
6 mH
48 mH
24 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

30 mH
38 mH
48 mH
36 mH

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