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Question

The working of electric fuse is based on:

A
Ohm’s law
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B
Joule’s law of heating
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C
Coulomb’s law
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D
Faraday’s law
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Solution

The correct option is B Joule’s law of heating
The working principle of a fuse is nothing but heating effect of electric current, also known as Joule's law of heating. According to Joule's law of heating when current 'I' flows through a conductor of resistance R, heat is produced. The heat produced (H) depends directly on the square of the current, resistance and time t for which the current is allowed to pass.
H = I2 Rt.

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