A wire of resistance 4 ohm is stretched to twice its original length
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Answer:
The “resistance of a wire” after stretched is 16 ohm.
Explanation:
The resistance can be calculated as follows:
(Resistivity)*(length)/(cross sectional area)
So, if wire is cylindrical, stretching its length to twice, will reduce the cross sectional area by half (keeping the volume of wire same in both cases). So new resistance will be '4′ times the original resistance i.e. 16 ohm.
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