The supply voltage to room is 
. The resistance of the lead wires is 
. A 
bulb is already switched on. What is the decrease of voltage across the bulb, when a 
heater is switched on in parallel to the bulb?
Text Solution
Verified by ExpertsThe correct answer is:
D
Power of bulb 
(given)
Resistance of bulb 
Power of heater 
(given)
Resistance of heater 
Voltage across bulb after heater is switched on,
Hence decrease in voltage
Volt (approximately)
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