If the length and cross-section of a wire are doubled, then

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Its resistance will increase two times

Its resistance will decrease four times

Its resistance will increase four times

Its resistance will remain unchanged

answer is D.

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Detailed Solution

The resistance remains unchanged because the increase in length cancels out the increase in cross-sectional area.
Resistance =

\frac{ρL}{A}

Where ‘L’ is the length of the wire, ‘A’ is the area of cross-section, and ρ is the resistivity of the wire.

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