An electric dipole consists of two opposite charges of magnitude q = 1 × 10 - 6 C separated by 2 cm . The dipole is placed in an external field of 1 × 10 5 N C - 1 . What maximum torque does the field exert on the dipole? How much work must an external agent do to turn the dipole end for end, starting from position of alignment ( θ = 0 0 )

2 × 10 - 3 N m , 4 × 10 - 3 J

4.4 × 10 6 N m , 3.2 × 10 - 4 J

- 2 × 10 3 N m , - 4 × 10 3 J

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 77

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The SI unit of surface integral of electric field is

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Important Questions on Electric Charges and Fields

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 78

A charge

q

is placed at the centre of the open end of a cylindrical vessel. The flux of the electric field through the surface of the vessel is -
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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 79

The electric flux through a closed surface area $S$ enclosing charge $q$ is $ϕ$ . If the surface area is doubled, then the flux is

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 80

The dimensional formula of electric flux is

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 81

A cylinder of radius

R

and length

L

is placed in a uniform electric field

E

parallel to the cylinder axis. The total flux for the surface of the cylinder is given by

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 82

An electric dipole consists of two opposite charges of magnitude

q = 1 \times 10^{- 6} C

separated by

2 cm

. The dipole is placed in an external field of

1 \times 10^{5}

N C^{- 1}

. What maximum torque does the field exert on the dipole? How much work must an external agent do to turn the dipole end for end, starting from position of alignment (

θ = 0^{0}

)

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 83

The relation between the intensity of the electric field of an electric dipole at a distance 'r' from its centre on its axis and the distance 'r' is ................

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 84

Electric field on the axis of a small electric dipole at a distance

r

is

\vec{E_{1}}

and

\vec{E_{2}}

at a distance of

2 r

on a line of perpendicular bisector. Then

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 85

An electric dipole has the magnitude of its charge as q and its dipole moment is p. It is placed in a uniform electric field E. If its dipole moment is along the direction of the field, the force on it and its potential energy are respectively

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