a uniform wire of resistance 100 ohm metre is melted and recast into wire of length double that of the original. what would be the resistance of the wire formed
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Volume will be same anyways. So (area*length) will be same in what ever shape u redraw it into. a1*l1=a2*l2. So u get new length of 2*l1 and area to be of a1/2. So the new resistance is 4*(that of the old resistance) =400
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The resistance R is directly proportional to the length l. Therefore, the resistance will be doubled.So,new resistance will be 200 ohm
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Ur answer is wrong
As recasting of the wire not only changes the length of the wire but also the area of cross section of the wire
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