Question

The answer is 4:9 or 9:4.But I don't know the exact and correct answer.If you know the correct answer then solve it with correct explanation.Don't copy from other websites.​

Answer 1

Answer:

Option(b)

Explanation:

(i) All bulbs are growing :

Req = (R/3) + (R/3) = 2R/3

Power(P) = E²/Req

              = 3E²/2R    ------ (1)

(ii) Two from Section A and Section B :

Req = R + R/2 = 3R/2

Power(Pi) = 2E²/3R      ------ (2)

Pi/Pf = (3E² * 3R)/(2R * 2E²)

       = 9/4

     = 9 : 4

Hope it helps!