By doubling the voltage across a resistor, one can obtain double the current of initial value. What can be said about resistance of the resistor?

Resistance is doubled

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Resistance is halved

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Resistance is unchanged

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Resistance cannot be determined

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Solution

The correct option is C Resistance is unchanged
By Ohm’s law: $V = I R$
Where $V$ = voltage, $I$ = current, and $R$ = resistance
Also, $R = \frac{(ρ L)}{A}$
The resistance (R) does not depend on the voltage or the current. It only depends upon the length, cross-sectional area, and the material of the resistor.

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