An electric bulb works on which of the following principles?
A
Magnetic effects of electric current
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B
Heating effect of electric current
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C
Cooling effect of electric current
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D
Both A and B
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Solution
The correct option is B Heating effect of electric current In a bulb, the filament gets heated up and starts glowing due to the flow of electric current. So it makes use of the heating effect of electric current.