Question

4. Two conducting wires of the same material and of equal lengths and equal diameters
are fyst 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
1:4
(d) 4:1
T
ito
rethenotential difference between​

Answer 1

Answer:

1:4

Step-by-step explanation:

Since the two wires have same material, length and diameter, they have the same resistance. Let the resistance of each wire be R.

Let applied potential difference be V.

R  series  =R  1 +R2  =R+R=2R

P  series  =V  2  /R  series   =V  2  /(2R)..........(i)

1/R  parallel  =  1 /R1 +1/R2

​R  parallel  =R/2

P  parallel  =V 2  /R  parallel

​          =2V  2  /R............(ii)

Dividing (ii) from (i),

P  series   /P Parallel =1/4