Question

Iwo 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 1

Answer:

b) 2:1

Explanation:

because all the properties are equal so resistance is also equal

so let resistance of both write is x

when they are connected in series:

R=R1+R2

R=x+x

R=2x

when connected in parallel

1/R=1/R1+1/R2

1/R=1/x+1/x

1/R=2/x

R=x/2

ratio-

2x:x/2