Which one of the following statements concerning emf is true?
a) Emf is the work done in moving the current from one terminal to the other of an emf device.
b) Emf is the work done in moving a single charge from one terminal to the other of an emf device.
c) Emf is the force exerted on a single charge to move it from one terminal to the other of an emf device.
d) Emf is the total charge moving from one terminal to the other of an emf device.
e) Emf is the electromagnetic force that is exerted between the terminals of an emf device.
Ans: b) Emf is the work done in moving a single charge from one terminal to the other of an emf device.
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