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The torque acting on the dipole and the potential energy are, respectively

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Important Questions on Electric Charges and Fields

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 97

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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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 98

An electric dipole of moment p is placed in an electric field of intensity E. The dipole acquires a position such that the axis of the dipole makes an angle

θ

with the direction of the field. Assuming that the potential energy of the dipole to be zero when

θ = 9 0^{o}

, the torque and the potential energy of the dipole will respectively be

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 99

An electric dipole of length 1 cm is placed with the axis making an angle of 30° to an electric field of strength

10^{4} N C^{- 1}

. If it experiences a torque of

10 \sqrt{2}

Nm, the potential energy of the dipole is

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 100

An electric dipole consists of two opposite charges, each of magnitude $1.0 μC$ separated by a distance of $2.0 cm$ . The dipole is placed in an external electric field of $10^{5} N C^{- 1}$ . The maximum torque on the dipole is

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 101

An electric dipole of dipole moment

(P)

is placed in an electric field

(E)

in stable equilibrium position. Which of the following represents the torque acting on the body?

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 102

Charge is distributed within a sphere of radius

R

with a volume charge density

ρ (r) = \frac{A}{r^{2}} e^{- \frac{2 r}{a}},

where

A

and

a

are constants. If

Q

is the total charge of this charge distribution, the radius

R

is_____.

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 103

There is a uniform spherically symmetric surface charge density at a distance

R_{0}

from the origin. The charge distribution is initially at rest and starts expanding because of mutual repulsion. The figure that represents best the speed

V (R (t))

of the distribution as a function of its instantaneous radius

R (t)

is:

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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 104

A solid sphere of radius

R_{1}

and volume charge density,

ρ = \frac{ρ_{0}}{r}

is enclosed by a hollow sphere of radius

R_{2}

with negative surface charge density

σ

such that the total charge in the system is zero.

ρ_{0}

is a positive constant and

r

is the distance from the centre of the sphere. The ratio

\frac{R_{2}}{R_{1}}

is,

The torque acting on the dipole and the potential energy are, respectively

Important Questions on Electric Charges and Fields

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