Here are multiple choice questions on electrostatics:

b.sc 3rd semester physics electrostatics mcq

The magnetic energy density stored in a coil is

- \frac{B^{2}}{2 \mu_0 }
- \frac{B^{2}}{4 \mu_0 }
- \frac{\mu_0 B^{2}}{2 }
- \frac{\mu_0^2 B}{2 }

Electrical energy of unit volume of electric field is

- \varepsilon_0E^2
- \frac{1}{2}\varepsilon_0E^2
- 2\varepsilon_0E^2
- \frac{\varepsilon_0E^2}{4}

Which of the following is a correct relation ?

- ⛛.B=1
- ⛛.B=0
- ⛛×B=0
- -⛛×B=μ0I

The relation shows the Gauss law

- \oint_S D.ds=\frac{q}{\varepsilon_0}
- div \overrightarrow{D}=\rho
- curl \overrightarrow{B}=\mu_0I
- \overrightarrow {E}=\frac {Q \hat {r}}{4 \pi \varepsilon_0 r^2 }

Relation between magnetic flux density B and vector potential A is

- \overrightarrow{B}=⛛ . \overrightarrow{A}
- \overrightarrow{B}=⛛ \times \overrightarrow{A}
- \overrightarrow{A}=⛛ . B
- \overrightarrow{A}={⛛} \times B

Correct relation for electric field and volume charge density is

- ⛛.E = \frac { \rho} {\varepsilon_0}
- ⛛ \times E = \frac { \rho} {\varepsilon_0}
- ⛛.E = \rho \varepsilon_0
- ⛛ \times E = \rho \varepsilon_0

The value of curl E is

- 1
- 0
- { \rho} {\varepsilon_0}
- { \rho} \times {\varepsilon_0}

Electric field E inside a hollow conductor when a charge Q is given to it is

- 0
- 1
- \frac{Q}{\varepsilon_0}
- \frac{1}{4 \pi \varepsilon_0}.\frac{Q}{r^2}

The relation for displacement current is

- D= \varepsilon_0 E+P
- D= \varepsilon_0 E - P
- D = \frac{\varepsilon_0 E}{P}
- D= \varepsilon_0 E \times P

Relation between dielectric constant K and electrical susceptibility x is

- K=1+x
- x=K+1
- x/K=1
- x ×K=1

What is the charge of a single electron?

A. 1.6 \times 10^{-21}

B. 1.7 \times 10^{-16}

C. 1.6 \times 10^{-19}

D. 1.5 \times 10^{-19}**Answer: C.** 1.6 \times 10^{-19}

What is the formula for electric potential?

A. V=\frac{q}{d}

B. V=\frac{W}{q}

C. V=\frac{kq}{r}

D. V=\frac{kq}{1}**Answer: C.V=\frac{kq}{r}**

What is the unit of electric potential?

A. Joule

B. Watt

C. Coulomb

D. Volt**Answer: D. Volt**

What is the force between two point charges?

A. F = \frac{kq_1q_2}{r^2}

B. F = kq_1q_22r

C. F = \frac{kq_1}{q_2r^2}

D. F = \frac{kq_1q_2}{2r}

Answer: A. \;\;\;\;\;\;F = \frac{kq_1q_2}{r^2}

What is the electric field intensity?

A. The amount of charge per unit length

B. The amount of force per unit charge

C. The amount of force per unit length

D. The amount of charge per unit force**Answer: B. The amount of force per unit charge**

What is the unit of electric field intensity?

A. Volt

B. Joule

C. Newton

D. Newton/Coulomb**Answer: D. Newton/Coulomb**

What is the electric flux density?

A. The amount of electric field per unit area

B. The amount of electric potential per unit area

C. The amount of electric charge per unit area

D. The amount of electric force per unit area**Answer: A. The amount of electric field per unit area**

What is the unit of electric flux density?

A. Volt

B. Coulomb

C. Newton

D. Newton/Coulomb^2

Answer: D. \;\ ;\;\; \;\;\; \frac{Newton}{Coulomb^2}

What is the electric charge per unit length of a conductor?

A. Electric current

B. Electric field intensity

C. Electric potential

D. Electric flux density**Answer: A. Electric current**

What is the capacitance of a parallel plate capacitor?

A. C = \frac{ε_0A}{d}

B. C = \frac{ε_0d}{A}

C. C = ε_0A{d

D. C = \frac{ε_0}{Ad}

Answer: A. \;\;\;\;\;\; C = \frac{ε_0A}{d}

What is the formula for capacitance of a sphere?

A. C = 4πε0R

B. C = 4πε0/R

C. C = 4πR/ε0

D. C = 4π/ε0R

Answer: B. C = 4πε0/R

What is the energy stored in a capacitor?

A. E = (1/2)CV^2

B. E = (1/2)CQ^2

C. E = (1/2)QV

D. E = 1/2(Q^2/C)

Answer: A. \;\;\;\;\;\; E = \frac{1}{2}CV^2

A. Energy stored in a charged object

B. Energy stored in a capacitor

C. Energy stored in an electric field

D. Energy stored in an electric circuit

Answer: A. Energy stored in a charged object

b.sc 2nd year 3rd semester physics electrostatics mcq

b.sc 3rd semester physics sample paper