Tue July 10, 2012 By: Arun Deepak Tirkey

We have a copper wire of resistance R.This wire is pulled so that its length is double(temp. remain constant).Find the new resistance of the wire in terms of its original resistance.

Expert Reply
Wed July 11, 2012
When length of the wire is doubled on being pulled, its area will get halved.
So the new resistance will be affected as:
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