A bulb is connected to an ideal battery of emf 10 V so that the resulting current is 10 mA. When the bulb is connected to 220 V mains (ideal), the current is 50 mA. Choose the correct alternative (s)
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a, c)
(i) R bulb = 
= 1. k Ω Ω
(ii) R bulb = 
= 4.4 k Ω Ω .
since increase in temperature increases resistance when it is connected to 220 V mains.
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