Electric Circuits
The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be

 R Ω
 2R Ω
 8R Ω
 4R Ω

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Electric Circuits
What is called the instantaneous value of an alternating current?

 The value of peak quantity at any instant.
 The value of peak current at any instant.
 The value of alternating frequency at any instant.
 The value of alternating quantity at any instant.

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