How To Find New Resistance In A Wire

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Question

A copper wire has a length L, a square cross-section of side length W and an end to end resistance R. Without loss of material the wire is sliced along its long direction to make 4 equal length wires of Equal Square cross-sections (see figure). These are then welded together end-to-end to make one wire that is 4 times the original length. The new resistance is:

 

Summary

The question belongs to Electrical Engineering and it discusses about a copper wire has a length L, a square cross-section of side length W and an end to end resistance R and made it four equal parts without loss of material. These are then welded together end-to-end to make one wire that is 4 times the original length. Then to find new resistance.

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