Two opposite and equal charges 4 × 10 - 8 C when placed 2 × 10 - 2 cm away form a dipole. If this dipole is placed in an external electric field 4 × 10 8 N C - 1 , then value of maximum torque and the work done in rotating it through 180 ° will be

32 × 10 - 4 N m and 64 × 10 - 4 J

64 × 10 - 4 N m and 64 × 10 - 4 J

32 × 10 - 4 N m and 32 × 10 - 4 J

64 × 10 - 4 N - m and 32 × 10 - 4 J

32 × 10 - 5 N - m and 64 × 10 - 5 J

Two opposite and equal charges 4 × 10 - 8 C when placed 2 × 10 - 2 cm away form a dipole. If this dipole is placed in an external electric field 4 × 10 8 N C - 1 , then value of maximum torque and the work done in rotating it through 180 ° will be

32 × 10 - 4 N m and 64 × 10 - 4 J

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Two opposite and equal charges $4 \times 10^{- 8} C$ when placed $2 \times 10^{- 2} cm$ away form a dipole. If this dipole is placed in an external electric field $4 \times 10^{8} N C^{- 1},$ then value of maximum torque and the work done in rotating it through $180 °$ will be

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Important Questions on Electrostatics

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 1 - Electrostatics>Objective Problems [ Level1 ]>Q 91

E_{a}

be the magnitude of 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

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JEE Advanced

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 1 - Electrostatics>Objective Problems [ Level1 ]>Q 92

The potential at a point due to an electric dipole will be maximum and minimum when the angles between the axis of the dipole and the line joining the point to the dipole are respectively

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 1 - Electrostatics>Objective Problems [ Level1 ]>Q 93

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 anti-parallel to the field, the work required to be done by an external agency is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 1 - Electrostatics>Objective Problems [ Level1 ]>Q 94

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 magnitude of electric field at the same point will be

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 1 - Electrostatics>Objective Problems [ Level1 ]>Q 95

An electric dipole when placed in a uniform electric field

E

will have minimum potential energy if the dipole moment makes the following angle with

E

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 1 - Electrostatics>Objective Problems [ Level1 ]>Q 96

Electric field at a far away distance

r

on the axis of a dipole is

E_{0} .

What is the electric field at a distance

2 r

on perpendicular bisector?

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 1 - Electrostatics>Objective Problems [ Level1 ]>Q 97

The SI unit of electric flux is:

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 1 - Electrostatics>Objective Problems [ Level1 ]>Q 98

If the electric flux entering and leaving an enclosed surface respectively is

ϕ_{1}

and

ϕ_{2}

the electric charge inside the surface will be

Two opposite and equal charges 4×10-8 C when placed 2×10-2 cm away form a dipole. If this dipole is placed in an external electric field 4×108 N C-1, then value of maximum torque and the work done in rotating it through 180° will be

Important Questions on Electrostatics

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Two opposite and equal charges $4 \times 10^{- 8} C$ when placed $2 \times 10^{- 2} cm$ away form a dipole. If this dipole is placed in an external electric field $4 \times 10^{8} N C^{- 1},$ then value of maximum torque and the work done in rotating it through $180 °$ will be