If the length and cross sectional area of a wire are doubled, its resistance will

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RRB ASSISTANT LOCO PILOT (Allahabad) 2010 click here to view all questions

If the length and cross sectional area of a wire are doubled, its resistance will

Aremain unchanged

Bbecome twice

Creduce to one half

Dincrease four times

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Correct answer is: remain unchanged Explanation: Wire’s cross section doubled means its cross section area is doubled. $\text{ Resistance} = \text{specific resistance} \times \frac{\text{length}}{\text{Area}}$ Hence, if length and  cross section area both doubled, resistance will remain same i.e inchanged. prakash ? answered Jan 2 '2020 at 13:4 All Comments

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