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MIT 8.02 Electricity and Magnetism, Spring 2002
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OpenStudy (anonymous):
Please help me with this question "in order to increase the resistance of a given wire of uniform area of cross-section to 4 times its original value , a fraction of its length is stretched uniformly till the full length of the wire becomes 3/2 times its original length. what is the value of this fraction?"
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OpenStudy (anonymous):
apply volume conservation and then use the formula r= rho( l/a)
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