The unit of e.m.f. of a cell is:A. dyneB. voltC. ampereD. joule

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Hint: If we look at what is emf i.e., electromotive force, it is defined as a battery’s energy per coulomb of charge passing through it. So we will obtain the unit of emf from the basic expression. EMF of a cell could be measured by a voltmeter and it is the voltage across the cell. Electromotive force is given by the expression$E=\dfrac{W}{Q}$.

i.e., $E=\dfrac{W}{Q}$