A 100watt bulb is connected to 200volts main. The resistance of the filament of the bulb is
400ohm
100ohm
200ohm
50ohm
A
200ohm
B
400ohm
C
100ohm
D
50ohm
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Solution
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Power in resistor is given by
P=V2R
P=100WattV=200Volts ∴R=V2P=200×200100=400ohm.
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