For which of the following value of current the mechanical energy produced by an electric motor will be maximum ?

2 ampere

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12 ampere

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6 ampere

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8 ampere

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Solution

The correct option is B 12 ampere
The energy produced by an electrical motor is directly proportional to the square of the current flowing through its coil.Hence it is maximum for maximum current flowing.As $W = I^{2} R t$ .

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