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Grade upto college level IIT JEE Entrance Exam

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

Profile image of Amit Saxena
12 Years agoGrade upto college level
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1 Answer

Profile image of Aditi Chauhan
12 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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