Question

HELP GIVING MEDALS N BECOMING A FAN!!!!!!
1. A capacitor has a capacitance of 3 pF. What potential difference would be required to store a charge of 21 pC?


3 V

21 V

7 V

0.14 V

2. A capacitor of capacitance 4 μF is connected to a 1.5 V battery. How much electrical potential energy is stored?


9.0 x 10^-6 J

2.7 x 10^-6 J

6.0 x 10^-6 J

4.5 x 10^-6 J

Answer 1

@IrishBoy123 @DanJS @SolomonZelman @Nnesha

Answer 2

for first question, we know capacitance C as:

\(\huge C = \frac{Q}{V}\).

for second question, this is the energy equation in its 3 forms

\(\huge E = \frac{Q^2}{2\ C} = \frac{C\ V^2}{2} = \frac{Q \ V}{2}\)

you should have a play, choose the right one for the situation, and see where you go.