Three copper wires of lengths and cross‐ sectional areas are 
and 
. Resistance is minimum in
A
wire of cross‐sectional area 
B
wire of cross‐sectional area 
C
wire of cross‐sectional area 
D
same in all three cases.
Text Solution
Verified by ExpertsThe correct answer is:
A
Three wires of lengths and cross‐ sectional areas 
and 
. Resistance of a wire 
For 
wire, 
For 
wire, 
For IIIrd wire, 
Therefore resistance of the wire will be minimum for IIIrd wire.
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