Three copper wires of length and cross–sectional area (L, A), (2L, A/2) and (L/2, 2A). Resistance is minimum in
Text Solution
Verified by ExpertsThe correct answer is:
C
Three wires of lengths and cross-sectional areas 
and 
.
Resistance of a wire 
.
For Ist wire, 
For 
wire, 
For 
wire, 
Therefore resistance of the wire will be minimum for 
wire.
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