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
AIPMT 1989, Easy
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(b) When $1$ bulb fuses, the total resistance of the circuit decreases hence the current increases. Since $P = {i^2}R$, therefore illumination increases.
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