Current Electricity Charging Discharging Of Capacitors Question 438
Question: 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
[NCERT 1972; Haryana CEE 1996; DPMT 2001]
Options:
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 of $ 49^{2}:39^{2} $
Show Answer
Answer:
Correct Answer: B
Solution:
When 1 bulb fuses, the total resistance of the circuit increases hence the current decreases. Since $ P=i^{2}R $ ,
Therefore illumination increases.
BETA
