• # question_answer 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] 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 ${{49}^{2}}:{{39}^{2}}$

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