Two conducting wires of the same material and of equal lentghs and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be-
a) 1:2
b) 2:1
c) 1:4
d) 4:1
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Answer:
d,4:1
Explanation:
because in series resistance is
R= R1+R2
while in parallel
1/R=1/R1+1/R2
and ratio become
ratio=R1+R2/1/R1+1/R2= 4:1
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