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Question

is not an emf device.

A
Electric Generator
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B
Battery
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C
Solar Cell
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D
Capacitor
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Solution

The correct option is D Capacitor
All these devices except the capacitor use some other form of energy to convert it into electrical potential energy.
An electric Generator converts mechanical energy into electric potential energy.
A battery converts chemical energy into electric potential energy.
However, a capacitor is more like a spring which only stores electrical energy.

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