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A bulb is connected to an ideal battery of emf \( 10 \mathrm{~V} \) so that the resulting current is \( 10 \mathrm{~mA} \). When the bulb is
P connected to \( 220 \mathrm{~V} \) mains (ideal), the current is \( 50 \mathrm{~mA} \).

W) Choose the correct alternative(s)
(a) In the first case, the resistance of the bulb is \( 1 \mathrm{k} \Omega \) and in second case, it is \( 4.4 \mathrm{k} \Omega \).
(b) It is not possible since ohm's law is not followed
(c) The increase in resistance is due to heating of the filament of the bulb when it is connected to \( 220 \mathrm{~V} \) mains
(d) None of these
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