Electrostatics Test

Result

Electrostatics Test - 52

Score
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Question 1
4 / -1

A
α

B
θ

C
θ + α

D
θ + 2α
Question 2
4 / -1

An electron dipole is placed along the x-axis at the origin O. A point P is at a distance of 20 cm from this origin such that OP makes an angle θ with the x-axis, the value of θ would be

A

B

C

D

Solution
Question 3
4 / -1

Electric charges q, q,–2q are placed at the corners of an equilateral triangle ABC of side l. The magnitude of electric dipole moment of the system is

A
ql

B
2ql

C

D
4ql

Solution
Question 4
4 / -1

The electric field at a point on equatorial line of a dipole and direction of the dipole moment

A
Will be parallel

B
Will be in opposite direction

C
Will be perpendicular

D
Are not related

Solution
Question 5
4 / -1

Two opposite and equal charges 4 × 10^–8 coulomb when placed 2 × 10^–2 cm away, form a dipole. If this dipole is placed in an external electric field 4 × 10⁸ newton/coulomb, the value of maximum torque and the work done in rotating it through 180° will be

A
64 × 10^–4 Nm and 64 × 10^–4 J

B
32 × 10^–4 Nm and 32 × 10^–4 J

C
64 × 10^–4 Nm and 32 × 10^–4 J

D
32 × 10^–4 Nm and 64 × 10^–4 J

Solution
Question 6
4 / -1

An electric dipole is placed in an electric field generated by a point charge

A
The net electric force on the dipole must be zero

B
The net electric force on the dipole may be zero

C
The torque on the dipole due to the field must be zero

D
The torque on the dipole due to the field may be zero
Question 7
4 / -1

If the magnitude of intensity of electric field at a distance x on axial line and at a distance y on equatorial line on a given dipole are equal, then x : y is

A
1 : 1

B

C
1 : 2

D

Solution
Question 8
4 / -1

An electric dipole in a uniform electric field experiences (When it is placed at an angle θ with the field)

A
Force and torque both

B
Force but no torque

C
Torque but no force

D
No force and no torque
Question 9
4 / -1

The electric field due to an electric dipole at a distance r from its centre in axial position is E. If the dipole is rotated through an angle of 90° about its perpendicular axis, the electric field at the same point will be

A
E

B

C

D
2E
Question 10
4 / -1

A molecule with a dipole moment p is placed in an electric field of strength E. Initially the dipole is aligned parallel to the field. If the dipole is to be rotated to be anti-parallel to the field, the work required to be done by an external agency is

A
–2pE

B
–pE

C
pE

D
2pE

Solution