A wire of nichrome of length 80cm has a resistance of 50 ohms. if the wire is four folded, find new resistance.

Answer 1

not sure what "four folded" means.

If you mean the cross-section area is multiplied by 4, then the resistance is divided by 4.

If the diameter is multiplied by 4, then the resistance is divided by 16

If the length is multiplied by 4, then also the resistance.

Answer 2

0.
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