Wire of resistance 5ohm is uniformly stretched until the new length becomes 4 times the original length.find its new resistance
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The resistance of wire is dependant on three factors- the resistivity, the cross sectional area and of course the length.
Meanwhile the volume of the wire is therefore the multiplication of the cross sectional area with the length which means V=A*L.
Therefore, if you were to compute the ratio between the new value of resistance along with the original ratio then the answer would be 9R=45Ohm.
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