A filament bulb (500 W,100 V) is to be used in a 230 V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500 W. The value of R is
(a) 230 (b) 46
(c) 26 (d) 13
(c) If a rated voltage and power are given,
Current in the bulb,
Resistance of bulb,
Resistance R is connected in series.