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A wire has a resistance R. Find new resi...

A wire has a resistance R. Find new resistance,
(i) if radius of cross-section of a cylindrical wire is doubled, then find ratio of initial to final resistance.
(ii) if length of wire is increased by `10%`, then find the percentage increase in its resistance.
(iii) if length of wire is increased by `20%`, then find the percentage increase in its resistance.

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DC PANDEY ENGLISH-CURRENT ELECTRICITY-Example
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