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Electricity

Question 4:

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) The Joule heating is given by, H = i2Rt

Let, R be the resistance of the two wires.

The equivalent resistance of the series connection is RS = R + R = 2R

If V is the applied potential difference, then it is the voltage across the equivalent resistance.

The heat d…

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