(D) The net force on an electric dipole in a uniform electric field is always zero,because the forces on the two charges ($+q$ and $-q$) are equal in

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Both Assertion $\&$ Reason are False.

(D) The net force on an electric dipole in a uniform electric field is always zero,because the forces on the two charges ($+q$ and $-q$) are equal in magnitude and opposite in direction $(F = qE + (-qE) = 0)$. Thus,the Assertion is False.The torque acting on a dipole in a uniform electric field is given by $\tau = PE \sin \theta$. When the axis is perpendicular to the field,$\theta = 90^{\circ}$,so $\tau = PE \sin 90^{\circ} = PE$,which is the maximum torque,not zero. Thus,the Reason is also False.

Class 12 Physics Electric Charges and Fields Electric Dipole and Electric Field

Medium

Assertion $:-$ An electric dipole experiences maximum force in a uniform electric field,when it is placed with its axis at right angles to the field direction.
Reason $:-$ When the axis of a dipole is perpendicular to a uniform external electric field,then torque acting on it will be zero.

A
Both Assertion $\&$ Reason are True $\&$ the Reason is a correct explanation of the Assertion.
B
Both Assertion $\&$ Reason are True but Reason is not a correct explanation of the Assertion.
C
Assertion is True but the Reason is False.
D
Both Assertion $\&$ Reason are False.

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Electric Charges and Fields

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Electric Dipole and Electric Field

An electric dipole of dipole moment $\vec{p}$ is lying along a uniform electric field $\vec{E}$. The work done in rotating the dipole by $90^{\circ}$ is:

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An electric dipole of moment $\vec{P}$ is lying along a uniform electric field $\vec{E}$. The work done in rotating the dipole through $\frac{\pi}{3}$ radians is:

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$A$ neutral water molecule $(H_2O)$ in its vapor state has an electric dipole moment of magnitude $6.4 \times 10^{-30} \ C \cdot m$. How far apart are the molecule's centers of positive and negative charge?

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The electric field due to a short electric dipole at a large distance $(r)$ from the center of the dipole on the equatorial plane varies with distance as:

MediumJEE MAIN 2023

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The torque acting on a dipole of moment $\overrightarrow{P}$ in an electric field $\overrightarrow{E}$ is:

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Assertion $:-$ An electric dipole experiences maximum force in a uniform electric field,when it is placed with its axis at right angles to the field direction.Reason $:-$ When the axis of a dipole is perpendicular to a uniform external electric field,then torque acting on it will be zero.

Similar Questions

An electric dipole of dipole moment $\vec{p}$ is lying along a uniform electric field $\vec{E}$. The work done in rotating the dipole by $90^{\circ}$ is:

An electric dipole of moment $\vec{P}$ is lying along a uniform electric field $\vec{E}$. The work done in rotating the dipole through $\frac{\pi}{3}$ radians is:

$A$ neutral water molecule $(H_2O)$ in its vapor state has an electric dipole moment of magnitude $6.4 \times 10^{-30} \ C \cdot m$. How far apart are the molecule's centers of positive and negative charge?

The electric field due to a short electric dipole at a large distance $(r)$ from the center of the dipole on the equatorial plane varies with distance as:

The torque acting on a dipole of moment $\overrightarrow{P}$ in an electric field $\overrightarrow{E}$ is:

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Assertion $:-$ An electric dipole experiences maximum force in a uniform electric field,when it is placed with its axis at right angles to the field direction.
Reason $:-$ When the axis of a dipole is perpendicular to a uniform external electric field,then torque acting on it will be zero.