Let the resistances be R1andR2
So S=R1+R2
P=R1R2R1+R2
S=nP
R1+R2=nR1R2R1+R2
(R1+R2)2=nR1R2
Minimum occurs for R1=R2 and the minimum value is 4
Ans : (c )
this is your answer.
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Let the resistances be R1andR2
So S=R1+R2
P=R1R2R1+R2
S=nP
R1+R2=nR1R2R1+R2
(R1+R2)2=nR1R2
Minimum occurs for R1=R2 and the minimum value is 4
Ans : (c )
this is your answer.