Default Title

Question (11)

QN0038985

A dipole is placed in an electric field as shown. In which direction will it move?

(A)
Towards the right as its potential energy will increase.
(B)
Towards the left as its potential energy will increase.
(C)
Towards the right as its potential energy will decrease.
(D)
Towards the left as its potential energy will decrease.

Correct Answer: C

Explanation:

Potential energy of electric dipole in external electric field

Since angle between and is

On moving towards right electric field strength decrease

decreases.

Net force on electric dipole is towards right and net torque acting on it is zero so move towards right.

Note : Potential energy of a dipole stable equilibrium and i.e., minimum value. For and dipole is not in equilibrium. For i.e., maximum value and dipole is in unstable equilibrium.

Link:

Report Error

Question (12)

QN0038986

The equivalent capacitance of the combination shown in the figure is

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

The circuit is as shown is figure,

Points are connected by conducting wire so these points are at same potential.

So the capacitor is short circuited. So it does not store any charge.

Therefore equivalent capacitance

Link:

Report Error

Question (13)

QN0038987

Twenty seven drops of same size are charged at each. They combine to form a bigger drop. Calculate the potential of the bigger drop.

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

Let charge and radius of smaller drop is and respectively and radius of bigger drop

For smaller drop, electric potential,

As volume remains the same

And from conservation of charge,

Potential of bigger drop,

Link:

Report Error

Question (14)

QN0038988

Two hollow conducting spheres of radii and ) have equal charges.
The potential would be :

(A)
more on smaller sphere
(B)
equal on both the spheres
(C)
dependent on the material property of the sphere
(D)
more on bigger sphere

Correct Answer: A

Explanation:

Potential, of hollow conducting sphere,

constant

So,

Link:

Report Error

Question (15)

QN0038989

The angle between the electric lines of force and the equipotential surface is:

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

Electric field vectors are always to equipotential surface.

Link:

Report Error

Question (16)

QN0038990

A capacitor of capacitance is charged fully by 100 battery as shown in figure (a). Then it is disconnected from the battery and connected to another uncharged capacitor of capacitance as shown in figure (b). The electrostatic energy stored by the system (b) is

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

By conservation of charge

So,

Link:

Report Error

Question (17)

QN0038991

An electric dipole is placed as shown in the figure.
The electric potential (in ) at point due to the dipole is ( permittivity of free space and )

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

Electrostatic potential due to a point charge is given by

Link:

Report Error

Question (18)

QN0038992

Six charges and are fixed at the corners of a hexagon of side as shown in the figure. The work done in bringing a charge to the centre of the hexagon from infinity is :
( - permittivity of free space)

(A)
(B)
Zero
(C)
(D)

Correct Answer: B

Explanation:

Potential at the centre of hexagon is zero i.e.,

Link:

Report Error

Question (19)

QN0038993

The equivalent capacitance of the system shown in the following circuit is

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

For parallel grouping,

For series grouping,

Link:

Report Error

Question (11)

A dipole is placed in an electric field as shown. In which direction will it move?

Explanation:

Link:

Question (12)

The equivalent capacitance of the combination shown in the figure is

Explanation:

Link:

Question (13)

Twenty seven drops of same size are charged at each. They combine to form a bigger drop. Calculate the potential of the bigger drop.

Explanation:

Link:

Question (14)

Two hollow conducting spheres of radii and ) have equal charges. The potential would be :

Explanation:

Link:

Question (15)

The angle between the electric lines of force and the equipotential surface is:

Explanation:

Link:

Question (16)

A capacitor of capacitance is charged fully by 100 battery as shown in figure (a). Then it is disconnected from the battery and connected to another uncharged capacitor of capacitance as shown in figure (b). The electrostatic energy stored by the system (b) is

Explanation:

Link:

Question (17)

An electric dipole is placed as shown in the figure.The electric potential (in ) at point due to the dipole is ( permittivity of free space and )

Explanation:

Link:

Question (18)

Six charges and are fixed at the corners of a hexagon of side as shown in the figure. The work done in bringing a charge to the centre of the hexagon from infinity is : ( - permittivity of free space)

Explanation:

Link:

Question (19)

The equivalent capacitance of the system shown in the following circuit is

Explanation:

Link:

Excel With Tutors

ExcelWithTutors

For Student

For Tutors

Learn

OUR POLICY

Two hollow conducting spheres of radii and ) have equal charges.
The potential would be :

An electric dipole is placed as shown in the figure.
The electric potential (in ) at point due to the dipole is ( permittivity of free space and )

Six charges and are fixed at the corners of a hexagon of side as shown in the figure. The work done in bringing a charge to the centre of the hexagon from infinity is :
( - permittivity of free space)