A2.74 f and a 7.46 f capacitor are connected in series across a 40.0-v battery. a 10.1 f capacitor is then connected in parallel across the 2.74-uf capacitor. determine the voltage across the 10.1 f capacitor.

14.7 Volt

Explanation:

C1 = 2.74 F, C2 = 7.46 F, C3 = 10.1 F

Here C1 and C3 are in parallel

So, Cp = C1 + C3 = 2.74 + 10.1 = 12.84 F

Now Cp and C2 are in series

1 / C = 1 / Cp + 1 / C2

1 / C = 1 / 12.84 + 1 / 7.46

C = 4.72 F

Let q be the total charge

q = C V = 4.72 x 40 = 188.8 C

Voltage across C2

V2 = q / C2 = 188.8 / 7.46 = 25.3 V

Voltage across C2 or c3

V' = V - V2 = 40 - 25.3

V' = 14.69

V' = 14.7 Volt

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.