Question

ANSWER TO GET 30 POINTS...................
Two conducting wires of same material with equal
lengths and equal diameters are first connected in
series and then parallel in an electric circuit. The ratio
of heat produced in series and parallel combination
would be :
(a) 1 : 2 (b) 2 : 1
(c) 1 : 4 (d) 4 : I
GIVE EXPLANATION TO GET FULL POINTS

Answer 1

Answer:

1:4

Explanation:

Heat produced in the circuit is inversely proportional to the resistance R.

Let RS be the equivalent resistances of the wires if connected in series and RP be the equivalent resistances of the wires if connected in parallel

Then RS =R+R=2R

And 1/ RP = 1/R +1/R

1/ RP = 2/R

Or RP =R/2

Now the ratio of heat produced is given by

= 1/4