WAEC Physics 2011 Paper

Concept:Capacitance measures a capacitor's ability to store electric charge.Its SI unit is named after Michael Faraday.Explanation:Capacitance is defined as the ratio of charge stored to the potential difference across the capacitor.It is given by the relation:$$C = \frac{Q}{V}$$Here, $Q$ is the charge in coulombs and $V$ is the potential difference in volts.So, the SI unit of capacitance is coulomb per volt.This unit is called the farad, denoted by $\mathrm{F}$.Option A, “farad”, is the correct unit.Option B, “coulomb”, is the unit of electric charge.Option C, “henry”, is the unit of inductance.Option D, “ohms”, is the unit of electrical resistance.Thus, only farad represents capacitance.Answer:A. farad