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Electric Power

If the potent...

Question

If the potential difference between the ends of a fixed resistor is halved the electric power will become.

A

Half

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B

One-Fourth

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C

Double

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D

Four times

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Solution

The correct option is B One-Fourth
P = V^2/R
If the voltage is changed for a fixed resistor from V to V/2 then the resultant power will become,
P = V^2/4R, which is one-forth of the original power.

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