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Electromagnetic induction

Electromagnetic induction
Which circuit element(s) will oppose the change in circuit current?

Capacitance only
Inductance and capacitance
Inductance only
Resistance only

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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
In case all the flux from the current in coil 1 links with coil 2, the coefficient of coupling will be

0.5
1.0
2.5
2.0

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

Air core
Laminated iron core
Iron core
Powdered iron core

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Electromagnetic induction
In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will

None of the listed here
Increases
Remains same
Decreases

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Electromagnetic induction
Two 300 uH coils in series without mutual coupling have a total inductance of

900 uH
600 uH
1200 uH
300 uH

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