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 :-
(1) 26 ``\Omega``
(2) 13 ``\Omega``
(3) 230 ``\Omega``
(4) 46 ``\Omega``