Free Printable Electric Charges and Fields

1.

Two charges $3\times10^{-5}C$ and $5\times10^4C$ are placed at a distance 10 cm from each other. Find the value of electrostatic force acting between them.

a)

$13.5\times10^{11}N$

b)

$40\times10^{11}N$

c)

$180\times10^9N$

d)

$13.5\times10^{10}N$

2.

What is the S. I. unit of electric flux?

a)

$\frac{N}{C}\times m^2$

b)

$N\times m^2$

c)

$\frac{N}{m^2}\times C$

d)

$\frac{N^2}{m^2}\times C^2$

3.

Electric flux is a vector quantity.

a)

True

b)

False

4.

Gauss law is valid only for the fields which follows inverse square law.

a)

True

b)

False

5.

Charge given to a spherical conductor is uniformly distributed in its entire volume.

a)

True

b)

False

6.

The electric force between two charges changes, if we bring a third charge closer to them.

a)

True

b)

False

7.

Quantization of charge can be neglected at macroscopic level.

a)

True

b)

False

8.

Electric dipole moment is a _____________ quantity.

a)

Tensor

b)

Scalar

c)

Vector

d)

Ambiguous

9.

Two unequal charges exert _____________ magnitude of force on each other.

a)

Unequal

b)

Equal

c)

Zero

d)

Infinite

10.

Net electrostatic field inside a positively charged conductor is ______________.

a)

Always Positive

b)

Always Negative

c)

Zero

d)

dependent on nature of conductor

11.

A silk cloth rubbed with a glass rod has a charge $q=-1.6\times10^{-19}C$ , then the charge on the glass rod will be ______________.

a)

$-1.6\times10^{-19}C$

b)

$+1.6\times10^{-19}C$

c)

$-1.6\times10^{19}C$

d)

$+1.6\times10^{19}C$

12.

A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the electric flux will _____________.

a)

increase

b)

decrease

c)

remain same

d)

first decrease then increase

13.

On charging a neutral inflated Balloon, its size:

a)

Increases

b)

Decreases

c)

Remains same

d)

No relation between charge & size

14.

Electric field intensity due to a short dipole remains directly proportional to:
(where, r → distance of a point from centre of dipole)

a)

$r^2$

b)

$r^3$

c)

$r^{-2}$

d)

$r^{-3}$

15.

Four charges +8C, -3C, +5C and -10C 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

16.

In the process of charging, the mass of the negatively charged body:

a)

Increases

b)

Decreases

c)

Remains constant

d)

None of the given options

17.

For a point charge, the graph between electric field versus distance is given by:

a)

b)

c)

d)

18.

$If\ \oint E.dS=0,\$ inside a surface, that means :

a)

Discontinued field lines inside the surface

b)

Charge is present inside the surface

c)

there is no net charge present inside the surface

d)

Uniform electric field inside the surface

19.

What will be the value of electric field at the centre of the electric dipole?

a)

Zero

b)

Equal to the electric field due to one charge at centre

c)

Twice the electric field due to one charge at centre

d)

half the value of electric field due to one charge at centre

20.

The value of electric field inside a conducting sphere having radius R and charge Q will be:

a)

$\frac{kQ}{R^2}$

b)

$\frac{kQ^2}{R^2}$

c)

Zero

d)

$\frac{kQ}{R^{ }}$

21.

Charge on a body is integral multiple of $\pm e$ . It is given by the law of:

a)

Conservation of charge

b)

Conservation of mass

c)

Quantization of charge

d)

Conservation of energy

22.

If Charge Q is kept in a sphere of 5 cm first than it is kept in a cube of side 5 cm, then the outgoing flux will be:

a)

Electric Charges and Fields

Total questions: 25

Worksheet time: 20mins

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