Question

The resistance of a manganin wire of 10mm long is 50 ohms .If it's cross sectional area is 0.1 mmsquare . Calculate it's specific resistance in ohm metre
if the wire is stretched to four times it's original length by how many times would you expect it's resistance to be increased
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Answer 1

Explanation:

R = ro * l / A

50 = ro * 10 -3 / 10 -7

50 * 10 -4 ohm.m