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Electromagnetic induction

Electromagnetic induction
Which of the following circuit elements will oppose the change in circuit current?

All of the listed here
Resistance
Inductance
Capacitance

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Electromagnetic induction
A crack in the magnetic path of an inductor will result in

Reduced inductance
Unchanged inductance
Increased inductance
Zero inductance

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Electromagnetic induction
The polarity of the induced voltage can be determined by using the left-hand generator rule.

No
Yes

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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

24 mH
12 mH
3 mH
28 mH

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Electromagnetic induction
Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be

Doubled
Halved
Unaffected
Quadrupled

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

500 ohms
1000 ohms
100 ohms
5000 ohms

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