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CBSE - Class 12 Physics Electrostatic Potential and Capacitance Worksheet

1.
A 12pF capacitor is connected to a 50V battery. How much electrostatic energy is stored in the capacitor?
2.

WHEN CHARGE IN MOTION IT PRODUCES

a.

ELECTRIC FIELD

 b.

MAGNETIC FIELD

 c.

ELECTRIC AND MAGNETIC FIELD 

 d.

ELECTRIC FIELD , MAGNETIC FIELD AND REDIATES ENERGY
3.
A spherical conductor of radius 12 cm has a charge of $1.6 \times 10^{-7}$C distributed uniformly on its surface. What is the electric field
(a) inside the sphere
4.
A 600pF capacitor is charged by a 200V supply. It is then disconnected from the supply and is connected to another uncharged 600 pF capacitor. How much electrostatic energy is lost in the process?
5.

Explain what would happen if in the capacitor given in a parallel plate capacitor with air between the plates, each plate has an area of $6 \times 10^{-3}$ m$^2$ and the distance between the plates is 3 mm. Calculate the capacitance of the capacitor. If this capacitor is connected to a 100 V supply, what is the charge on each plate of the capacitor? a 3 mm thick mica sheet (of dielectric constant = 6) were inserted between the plates, (b) after the supply was disconnected.

6.
Two charges $2 \mu$C and $-2 \mu$C are placed at points A and B 6 cm apart.
(b) What is the direction of the electric field at every point on this surface?
7.
Two charges $2 \mu$C and $-2 \mu$C are placed at points A and B 6 cm apart.
(a) Identify an equipotential surface of the system.
8.

Find the equivalent capacitance between the point A and B of the presented figure.

a.

$\frac{34}{7} \mu F$ 

 b.

$\frac{17}{7} \mu F$ 

 c.

$\frac{18}{7} \mu F$ 

 d.

$\frac{19}{7} \mu F$ 
9.
Three capacitors each of capacitance 9 pF are connected in series.
(b) What is the potential difference across each capacitor if the combination is connected to a 120 V supply?
10.

Determine the equivalent capacitance between the point A and B of the presented circuit.

a.

$\frac{2}{3} \mu F$ 

 b.

$\frac{4}{3} \mu F$

 c.

$\frac{1}{3} \mu F$

 d.

$\frac{5}{3} \mu F$
11.

The potential energy of two equal negative point charges of magnitude 2μC placed one meter apart in the air is

a.

2J

 b.

0.36J

 c.

4J

 d.

0.036J
12.
Three capacitors each of capacitance 9 pF are connected in series.
(a) What is the total capacitance of the combination?
13.
A parallel plate capacitor with air between the plates has a capacitance of 8 pF ($1$pF = $10^{-12}$ F). What will be the capacitance if the distance between the plates is reduced by half, and the space between them is filled with a substance of dielectric constant 6?
14.

What is a circuit?

a.

Rate of flow of electrons.

 b.

A closed path to flow current.
15.
A spherical conductor of radius 12 cm has a charge of $1.6 \times 10^{-7}$C distributed uniformly on its surface. What is the electric field
(c) at a point 18 cm from the centre of the sphere?
16.

Explain what would happen if in the capacitor given in a parallel plate capacitor with air between the plates, each plate has an area of $6 \times 10^{-3}$ m$^2$ and the distance between the plates is 3 mm. Calculate the capacitance of the capacitor. If this capacitor is connected to a 100 V supply, what is the charge on each plate of the capacitor?, a 3 mm thick mica sheet (of dielectric constant = 6) were inserted between the plates, (a) while the voltage supply remained connected.

17.
In a parallel plate capacitor with air between the plates, each plate has an area of $6 \times 10^{-3}$ m$^2$ and the distance between the plates is 3 mm. Calculate the capacitance of the capacitor. If this capacitor is connected to a 100 V supply, what is the charge on each plate of the capacitor?
18.

Evaluate the equivalent capacitance between the points A and B of the presented infinite ladder.

a.

$5 \mu F$ 

 b.

$(5-5\sqrt{5})\mu F$ 

 c.

$(5+5\sqrt{5})\mu F$ 

 d.

$5\sqrt{5}\mu F$ 
19.
Three capacitors of capacitances 2 pF, 3 pF and 4 pF are connected in parallel.
(b) Determine the charge on each capacitor if the combination is connected to a 100 V supply.
20.

What is voltage?

a.

Force required to move electrons

 b.

Potential difference between two points

Worksheet Answers

2.
Option D
8.
Option A
10.
Option B
11.
Option D
14.
Option B
18.
Option C
20.
Option A
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