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NUMS T6 Electrostatic

Total questions: 25

Worksheet time: 21mins

Name
Class
Date
1.

Coloumb force is

a)

Mutual force

b)

Short range force

c)

Centripetal force

d)

All of these

2.

The minimum change on an object can't be less then

a)

1.6x 10-19C

b)

9.1x109C

c)

100000c

d)

No defined value

3.

The number of electrons in one coulomb charge is equal to

a)

6.02 x 1018

b)

1.6 x 1019

c)

1.6 x 10-19

d)

6.23 x 10 21

4.

Units of permittivity of free space is

a)

F/m

b)

C2 /Nm

c)

Nm2 /C 2

d)

None

5.

Electric field lines

a)

Never cross each other

b)

Depends on charge shape

c)

Can cross each other

d)

Not enough information

6.

Photocopier and ink jet printer are application of

a)

Electrostatics

b)

Magnetism

c)

Thermal physics

d)

None

7.

If the distance between two point charges to become double then the coulomb force will be

a)

F/2

b)

2F

c)

4F

d)

F/4

8.

Charge is distributed uniformally on the surface of spherical baloon(an insulator).A point particle with Charge q is inside .The electric force on particle is greatest when:

a)

It is at center of baloon

b)

It is anywhere inside (force is zero everywhere)

c)

Halfway between baloon

d)

None

9.

Which diagram represents electric fields of negative point charge,shown

a)
b)
c)
d)
10.

Which diagram represents the electric field in the vicinity of a positive electric charge of magnitude Q.

a)
b)
c)
d)
11.

Neutral zone in electric field of two similar charge is region where

a)

Both positive an negative change present

b)

Equal amount of both positive and negative charge present

c)

Electric dipole exist

d)

No electri field lines passes

12.

When one electron is taken towards other electron then electric potential energy of system

a)

Decrease

b)

Same

c)

Zero

d)

Increase

13.

In electric polarization, induced and external field are

a)

Parallel

b)

Antiparallel

c)

Perpendicular

d)

None

14.

If 2 ohm resistance is connected to a capacitor of 1 micro farad, then time constant is ____micro farad.

a)

1

b)

2

c)

3

d)

1/2

15.

Which is principal of capacitor

a)

Charging by polarization

b)

Charging by electrostatic induction

c)

Charging by conduction

d)

Charging by radiation

16.

A surface enclosed an electric dipole.The electric flux through this surface is

a)

Positive

b)

Zero

c)

Negative

d)

None

17.

Choose incorrect option for electric field lines

a)
b)
c)
d)
18.

If plates of charged capacitor are still attached with battery and dielectric is inserted then

a)

Capacitance increase

b)

Charge increase

c)

Both

d)

None

19.

An alpha particle is accelerated through p.D of 103 volts .It's K.E is

a)

1kev

b)

2kev

c)

3kev

d)

4kev

20.

A surface encloses an electric dipole. The electric flux through that surface is

a)

Positive

b)

Negative

c)

Zero

d)

All

21.

The electric field at s distance of 10 cm from an isolated point particle with a charge of 2 x 10-9 C is ______N/C

a)

1.8

b)

180

c)

1800

d)

1800000

22.

The electric Intensity is expressed in units of N/C or

a)

Volts

b)

Joules

c)

Walt

d)

V/m

23.

In RC series circuit, for the rapid charging of a capacitor of constant capaticance, resistance attached should be

a)

Large

b)

Small

c)

Either large or small

d)

Both can be

24.

If the charge on plates of a capacitor is 4C and the energy stored in it is 4J then what will be value of capacitance

a)

2F

b)

4F

c)

9F

d)

5F

25.

The force between 2 similar unit charge placed one meter apart in air in Newton is

a)

zero

b)

One

c)

9x 10 11

d)

9 x 10 9