A given length of a wire is doubled on itself and this process is repeated once again .By what factor does the resistance of the wire changes? give reason by solving.

Asked by  | 24th May, 2012, 09:18: AM

Expert Answer:

If the length of wire is drawn to double its length then length has increased double and area get reduced to helf
 
So, Resitance will be 4 times.
 
And, again the process is repeated so resitance will increase 4 times. So tallay, the resitance get increased by 16 times.

Answered by  | 24th May, 2012, 10:21: AM

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