a wire of resistance 4r is cut into four equal parts . Each part is stretched to twice of its original length . if all four wires are connected in parallel after stretching . calculate the resistance of combination
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when divided into 4 each will have r resistance. Now r=rho*l/a so length doubled means r doubled. each will have 2r resistance. now 4 2r resistance in parallel means total r=2r/4
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