A 20-μF capacitor has a charge of 60 μC. How much energy is stored in this capacitor? A) 100 μJ B) 80 μJ C) 90 μJ D) 70 μJ E) 110 μJ

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Physics

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12 June, 12:50

A 20-μF capacitor has a charge of 60 μC. How much energy is stored in this capacitor? A) 100 μJ B) 80 μJ C) 90 μJ D) 70 μJ E) 110 μJ

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Nola Rush · Answer 1

C ... 90

Explanation:

Energy stored = 1/2 of (Charge * Voltage)

... then substitute Voltage with (Charge : Capacitance)

Then obtain the formula for energy stored as ...

E = 1/2 of (Charge) ^2 : Capacitance

= 0.5 x (60^2:20)

; Energy stored = 90