Electrostatics Test

Result

Electrostatics Test - 108

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Question 1
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 moments of the system is

A

B

C

D

Solution
Question 2
4 / -1

A

B

C
Zero

D
Question 3
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 4
4 / -1

Two opposite and equal charges 4 × 10^–8 coulomb when placed 2 × 10² cm away, form a dipole. If 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 5
4 / -1

If E_α be the electric field strength of a short dipole at a point on its axial line and E_e that on the equatorial line at the same distance, then

A
E_e = 2E_α

B
E_α =2E_e

C
E_α = E_e

D
None of these

Solution
Question 6
4 / -1

An electric dipole is placed in an electric field generated by 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

A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then electric field at Q is proportional to

A
p^–1 and r^–2

B
p and r^–2

C
p² and r^–3

D
p and r^–3

Solution
Question 8
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 9
4 / -1

The electric intensity due to a dipole of length 10 cm and having a charge of 500 µC, at a point on the axis at a distance 20 cm from one of the charges in air, is

A
6.25 × 10⁷ N/C

B
9.28 × 10⁷ N/C

C
13.1 × 11¹¹ N/C

D
20.5 × 10⁷ N/C

Solution
Question 10
4 / -1

Electric potential at an equatorial point of a small dipole with dipole moment P (r, distance from the dipole) is

A
Zero

B

C

D