Free Printable Electrostatics Laxman Singh

1.

If two balloons have the same charge, what will happen if you place them close to each other?

a)

Nothing

b)

They will be attracted

c)

They will pop

d)

They will push each other away.

2.

What is the name of this device that is used to detect charges?

a)

beaker

b)

electroscope

c)

van de graff generator

d)

chargometer

3.

What is the name of the particle that is being transferred?

a)

Proton

b)

Neutron

c)

Electron

d)

Positron

4.

During a physics lab, a plastic strip was rubbed with cotton and became positively charged. The correct explanation for why the plastic strip becomes positively charged is that ...

a)

the plastic strip acquired extra protons from the cotton.

b)

the plastic strip acquired extra protons from the charging process

c)

protons were created as the result of the charging process

d)

the plastic strip lost electrons to the cotton during the charging process

5.

Consider the conduction charging shown.

a)

Electrons move from the insulating stand into the sphere.

b)

Protons move from the bar into the sphere.

c)

Electrons move from the charged metal bar into the sphere.

d)

Protons move from the sphere into the negatively charged bar.

6.

Which net charge could be found on an object?

a)

4.8 x 10^-19 C

b)

1.8 x 10^-19 C

c)

3.0 x 10^-19 C

d)

2.8 x 10^-19 C

7.

Electrostatic force F exists between two point charges. If the both charges are doubled, the force between the charges will be

a)

F

b)

4F

c)

2F

d)

F/4

8.

Two similar metal spheres, A and B, have charges of +2.0 x 10^-6 coulomb and +1.0 x 10^-6 coulomb, respectively. The magnitude of the electrostatic force on A due to B is 4.0N newtons. What is the magnitude of the electrostatic force on B due to A?

a)

2.0N

b)

4.0N

c)

8.0N

d)

1.0N

9.

What does it mean when the electric field lines are close together?

a)

the field is positive

b)

the field is negative

c)

The field is strong

d)

the field is weak

10.

What do you call the process of charging a conductor by bringing it near another charged object?

a)

induction

b)

polarization

c)

neutralization

d)

conduction

11.

The law of conservation of charge states that...

a)

all atoms have more protons than electrons

b)

only protons can be rubbed off of an atom

c)

charge cannot be created or destroyed

d)

charge cannot be transferred

12.

After a balloon is rubbed against wool, the two objects will ________ each other because they have ___________ charges

a)

attract; like

b)

attract, opposite

c)

repel; like

d)

repel; opposite

13.

When a silver atom looses an electron, its net charge (in coulombs) is

a)

+1

b)

-1

c)

+1,6 x 10^-19

d)

-1,6 x 10^-19

14.

which is the field for opposite charges

a)

b)

c)

d)

15.

Why are insulators better "holders" charge?

a)

They discharge as easily as conductors

b)

insulators radiate electric fields

c)

conductors discharge to easily

d)

insulators cannot be charged

16.

What happens to the force between two charged objects if you double the distance between them and double the magnitude of one charge?

a)

4X

b)

6X

c)

1/2X

d)

1/6X

17.

A pith ball has an electric charge +2q, and it feels a force F when placed a distance d from a second pith ball with an electric charge -q. When the second pith ball is charged to -3q, the force on the pith ball is ---.

a)

6F

b)

2F

c)

3F

d)

F

18.

The diagram above shows three neutral metal spheres, x, y, and z, in contact and on insulating stands. Which diagram best represents the charge distribution on the spheres when a positively charged rod is brought near sphere x, but does not touch it?

a)

b)

c)

d)

19.

A volt is a unit of

a)

charge. .

b)

electric potential.

c)

energy.

d)

work.

20.

Which graph would best represent the relationship between voltage and energy stored in a capacitor?

a)

A

b)

B

c)

C

d)

D

21.

A capacitor stores an energy of 10J. If its area is doubled and the distance between its plates is cut in half, what would the new stored energy be?

a)

2.5 J

b)

5 J

c)

20 J

d)

40 J

22.

The S.I. unit for electric field is__________?

a)

n/C

b)

nC

c)

N/C

d)

NC

23.

Which of the following statements is false about electric field lines

a)

electric field lines cannot cross

b)

electric field lines point away from positive charge

c)

electric field lines are always straight lines

d)

electric field lines show how a proton would move in an electric field

24.

An electrostatic force of 2 X 10². newtons is exerted on a charge of 4 coulomb at point P in an electric field. The magnitude of the electric field intensity at P is

a)

8 X 10² N/C

b)

5 N/C

c)

2 X 10^-2 N/C

d)

50 N/C

25.

Two electric dipole is made of 1C and -1C and dipole length 3 mm. It's dipole moment is

a)

3 C-m

b)

-3 C-m

c)

0.03 C-m

d)

0.003 C-m

26.

Which graph best represents the relationship between the strength of an electric field and distance from a point charge?

a)

b)

c)

d)

27.

What orientation of an electric dipole in a uniform electric field corresponds to its stable equilibrium?

a)

30 degree

b)

perpendicular

c)

dipole moment along the direction of the electric field then it will be in stable equilibrium.

d)

parallel

28.

According to Quantization of charge

a)

Q=ne

b)

$Q=\frac{n}{e}$

c)

$Q=\frac{e}{n}$

d)

$Q=ne^2$

29.

The correct expression for the electric field intensity is

a)

$\overrightarrow{\ E\ }=\lim_{q_0\rightarrow0}\ q_0\overrightarrow{\ F\ }$

b)

$\overrightarrow{\ E\ }=\lim_{q_0\rightarrow0}\ \frac{\overrightarrow{\ F\ }^{2\ }}{q_{0\ }}$

c)

$\overrightarrow{\ E\ }=\lim_{q_0\rightarrow0}\ \frac{\overrightarrow{\ F\ }}{q_0^2}$

d)

$\overrightarrow{\ E\ }=\lim_{q_0\rightarrow0}\ \frac{\overrightarrow{\ F\ }}{q_0}$

30.

The net force on an electric dipole in an uniform electric field is

a)

0

b)

>0

c)

<0

d)

varies from negative to positive value from negative to positive charge.

31.

The expression for Torque on an electric dipole in an uniform electric field is __________

a)

$\overrightarrow{\ \tau\ }=\overrightarrow{E}\ \times\overrightarrow{p}\$

b)

$\overrightarrow{\ \tau\ }=\frac{\overrightarrow{p}}{\overrightarrow{E}}\$

c)

\overrightarrow{\ \tau\ }=\overrightarrow{p}\ \times\overrightarrow{E}

d)

$\overrightarrow{\tau}=\overrightarrow{p}.\overrightarrow{E}$

32.

According to Gauss’s law the total electric flux through a closed surface S is

a)

\phi=q^2\text{ }\epsilon_{0\ }

b)

$\phi=q\epsilon_0$

c)

$\phi=\frac{q}{\epsilon_0}$

d)

$\phi=\frac{\epsilon_0}{q}$

33.

Correct expression for electric flux through a surface is ________

a)

$\phi=\ \oint_{ }^{ }\overrightarrow{E}\times\overrightarrow{ds}$

b)

\phi=\ \oint_{ }^{ }\overrightarrow{E}.\overrightarrow{ds}

c)

$\phi=\ \oint\frac{\overrightarrow{E}}{ds}$

d)

$\phi=\oint q.ds$

34.

Electric field of a long straight wire at distance 'r'

a)

$E=\frac{\lambda}{2\pi r}$

b)

$E=\frac{\lambda}{4\pi\epsilon_0r}$

c)

E=\frac{\lambda}{2\pi\epsilon_0r}

d)

$E=\frac{\lambda}{2\pi\epsilon_0r^2}$

35.

Electric field of an infinite plane sheet of charge density σ

a)

E=\frac{\sigma}{2\epsilon_0}

b)

$E=\frac{\sigma}{\epsilon_0}$

c)

$E=\frac{\sigma}{4\epsilon_0}$

d)

$E=\frac{2\sigma}{\epsilon_0}$

36.

An electric dipole of dipole moment $2\times10^{-6}Cm$ is enclosed by a closed surface. What is the flux passing out of the surface?

a)

2\times10^{-6\ }Nm^2C^{-1}

b)

$\frac{\left(2\times10^{-6\ }Nm^2C^{-1}\right)}{\epsilon_0}$

c)

$0$

d)

$10^{-6\ }Nm^2C^{-1}$

37.

Expression for the electric field in the regions I, II, III shown in the figure

a)

$E_I=E_{III}=\frac{\sigma}{\epsilon_0}\ and\ E_{II}=0$

b)

$E_I=E_{II}=E_{III}=0\$

c)

$E_{II}=E_{III}=0\ \ and\ E_I=\frac{\sigma}{\epsilon_0}$

d)

$E_I=E_{III}=0\ \ and\ E_{II}=\frac{\sigma}{\epsilon_0}$

38.

Electrostatic potential energy is recorded in units of electron-Volts (eV). What is equivalent to 1 eV?

a)

1.602×10⁻¹⁹ 𝐽

b)

100 𝐽

c)

220 𝐽

d)

0.003 𝐽

39.

As a proton moves in the direction the electric field lines...

a)

it is moving from low potential to high potential and gaining electric potential energy.

b)

it is moving from low potential to high potential and losing electric potential energy.

c)

it is moving from high potential to low potential and gaining electric potential energy.

d)

it is moving from high potential to low potential and losing electric potential energy.

40.

A proton that is initially at rest is accelerated through an electric potential difference of magnitude 500 V. What speed does the proton gain? (e = 1.60 × 10^-19 C , mproton = 1.67 × 10^-27 kg)

a)

1.1 × 10⁵ m/s

b)

2.2 × 10⁵m/s

c)

9.6 × 10⁵ m/s

d)

3.1 × 10⁵ m/s

41.

In a region where the electric field is uniform and points in the +x direction, the electric potential is -2000 V at x = 8 m and is +400 V at x = 2 m. What is the magnitude of the electric field?

a)

500 V/m

b)

600 V/m

c)

200 V/m

d)

400 V/m

42.

If 500 J of work are required to carry a 40-C charge from one point to another, the potential difference between these two points is:

a)

12.5 V

b)

20,000 V

c)

0.08 V

d)

depends on the path

43.

Two point charges are separated by a distance of 10 cm. Charge on point A =+9 μC and charge on point B = +4 μC.

[k = 9 x 10⁹Nm²C⁻², 1 μC = 10⁻⁶ C]

What is the electric potential energy between these two charges?

a)

3.24 J

b)

5.54 J

c)

7.23 J

d)

6.45 J

44.

An electric charge is placed at the center of a cube of side 'a' . The electric flux on one of its faces will be

a)

$\frac{q}{6\in_0}$

b)

$\frac{q}{\in_0}$

c)

$\frac{q}{\in_0a^2}$

d)

zero

45.

The S.I. unit of electric flux is

a)

Joule per coulomb

b)

Newton per coulomb

c)

Weber

d)

Volt metre

46.

If the electric flux entering and leaving an enclosed surface respectively is $\phi_1$ and $\phi_2$ the electric charge inside the surface will be

a)

$\left(\phi_1+\phi_2\right)\in_0$

b)

$\left(\phi_1-\phi_2\right)\in_0$

c)

$\frac{\left(\phi_1+\phi_2\right)}{\in_0}$

d)

$\frac{\left(\phi_1-\phi_2\right)}{\in_0}$

47.

A conducting sphere has a charge +Q and a radius R. Which graph below describes the electric field as a function of distance r from the center of the sphere?

a)

b)

c)

d)

e)

48.

The area vector for a flat surface

a)

is parallel to the surface and has a magnitude equal to the length of a side of the surface.

b)

is perpendicular to the surface and has a magnitude equal to the length of a side of the surface.

c)

is parallel to the surface and has a magnitude equal to the area of the surface.

d)

is perpendicular to the surface and has a magnitude equal to the area of the surface.

49.

The flux of the electric field (24 N/C)i + (30 N/C)j + (16 N/C)k through a 2.0 m² portion of the yz plane is:

a)

32 N × m²/C

b)

34 N × m²/C

c)

42 N × m²/C

d)

48 N × m²/C

50.

A charge -2Q is placed at A ( 3,0,0) cm and another charge 8Q is placed at B ( 1,0,0)cm. Find the ratio of electric flux through concentric spheres S₁ and S₂centered at the origin with radius 2 cm & 5 cm respectively

a)

4/3

b)

4

c)

1/4

d)

4/5

e)

1/8

51.

What is the voltage across the plates of the capacitor if the capacitance is 10 uF and the Charge stored is 30 uC?

a)

0.333 V

b)

3 V

c)

300 V

52.

With respect to the capacitor, which relationship is true? •

a)

C = Q×V

b)

V = C×Q

c)

V = Q/C

d)

Q = C/V

53.

How is the capacitance of a parallel-plate capacitor affected by the potential difference across the capacitor ?

a)

C depend on the potential difference across the capacitor

b)

C does not depend on the potential difference across the capacitor

c)

C partially depend on the potential difference across the capacitor

d)

C sometime depend on the potential difference across the capacitor

54.

How is the capacitance of a parallel-plate capacitor affected by filling the space between the plates with an insulator ?

a)

C stable when the space between the plates is filled with an insulator, ε_r >1

b)

C reduces when the space between the plates is filled with an insulator, ε_r >1

c)

C increases when the space between the plates is filled with an insulator, ε_r >1

d)

C fluctuate when the space between the plates is filled with an insulator, ε_r >1

55.

If the capacitance is 47μF, and the voltage difference across the capacitor terminals is 6V, then the energy stored in that capacitor is:

a)

846×10^-6Joule

b)

7.23×10^-3 Joule

c)

6.76×10^-5Joule

d)

5.94×10^-2Joule

56.

The plates of a parallel-plate capacitor are 2.50mm apart, and each carries a charge of magnitude 80.0nC. The plates are in vacuum. The electric field between the plates has a magnitude of 4.00x10⁶V/m.

what is the capacitance?

a)

zero

b)

same as potential difference 4.00pF

c)

8.99pF

d)

8pF

e)

8.00x10^-9F

57.

Two capacitors of capacitance 3 $\mu F$ and 2 $\mu F$ are connected in series with the battery as shown in the diagram. If $V_1$ and $V_2$ are the potential difference across the capacitors of 3 $\mu F$ and 2 $\mu F$ respectively, what is the ratio of $\frac{V_1}{V_2}$ ?

a)

3:2

b)

3:1

c)

2:1

d)

2:3

58.

When capacitors is arrange in series (3 capacitors), the equivalent capacitance C is

a)

C = C₁ + C₂ + C₃

b)

1/C = 1/C₁ + 1/C₂ + 1/C₃

c)

C = QV₁ + QV₂ + QV₃

d)

C = CR₁ + CR₂ + CR₃

59.

14. Four charges + 8Q, - 3Q +5Q and -10Q are kept inside a closed surface. What will be the outgoing flux through the surface.

a)

26 V-m

b)

0 V-m

c)

10 V-m

d)

8 V-m

60.

Three point charges + q,-2q and +q are placed at points (x = 0, y =a, z = 0), (x =0, y = 0, z = 0) and (x = a, y = Q z = 0), respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are

a)

√2 aq along +y-direction

b)

√2 aq along the line joining points (x = 0,y = 0,z = 0) and (x = a,y = a,z = 0)

c)

qa along the line joining points (x = 0y = 0,z = 0) and (x = a,y = a,z = 0)

d)

√2 aq along + x-direction

Electrostatics Laxman Singh

Total questions: 60

Worksheet time: 1hrs 1mins

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