Resistance of a metal wire of length 1m is 4 Ω at 20⁰C. If the diameter of the wire is doubled, what will be the resistivity of the metal at that temperature?
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answer is 1 ohm..
Explanation:
r2 = 1/n square *r1
r2 = 1/ (2)2 * 4
r2= 1/4*4
r2= 1..
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