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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 (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



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


(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 402: 392


Grade:upto college level

1 Answers

Aditi Chauhan
askIITians Faculty 396 Points
9 years ago

(b)

Since,  the voltage is same for the two combinations, therefore

H inversely proportional to R.

Hence, the combination of 39 bulbs will glow more.

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