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Two conducting wires of the same material and of equal lengths 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
Answer :
(c)1:4
Both the wires have the same resistance because they are made of the same material and have equal lengths and diameters. Let the resistance be R.
For series combination, equivalent resistance Rs is
Rs = R + R = 2R
For parallel combination, equivalent resistance Rp is
