Current Electricity - Result Question 87

92. Forty electric bulbs are connected in series across a $220 V$ supply. After one bulb is fused the remaining 39 are connected again in series across the same supply. The illumination will be

[1989]

(a) more with 40 bulbs than with 39

(b) more with 39 bulbs than with 40

(c) equal in both the cases

(d) in the ratio $40^{2}: 39^{2}$

Show Answer

Answer:

Correct Answer: 92. (b)

Solution:

  1. (b) Since, the voltage is same for the two combinations, therefore $H \propto \frac{1}{R}$. Hence, the combination of 39 bulbs will glow more.