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

 2R Ω
 R Ω
 4R Ω
 8R Ω

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Electric Circuits
Which of the following characteristics is/are attributed to an ideal independent voltage source?

 Independent of the magnitude of voltage supplied.
 both ‘b’ and ‘d’.
 Independent of the direction of flow of current.
 Independent of magnitude of current supplied..

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