(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

Two electric dipoles of moment $P$ and $27 P$ are placed on a line with their centres $24 \,cm$ apart. Their dipole moments are in opposite directions. At which point between the dipoles, measured from the centre of the dipole of moment $P$, will the electric field be zero (in $\,cm$)?

MediumMHT CET 2023

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Which of the following options is a pair of polar molecules?

EasyGUJCET 2021

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An electric dipole with dipole moment $5 \times 10^{-6} \ Cm$ is aligned with the direction of a uniform electric field of magnitude $4 \times 10^5 \ N/C$. The dipole is then rotated through an angle of $60^{\circ}$ with respect to the electric field. The change in the potential energy of the dipole is (in $J$)

MediumNEET 2025

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Charges $-q$ and $+q$ located at $A$ and $B$,respectively,constitute an electric dipole. Distance $AB = 2a$,$O$ is the midpoint of the dipole and $OP$ is perpendicular to $AB$. $A$ charge $Q$ is placed at $P$ where $OP = y$ and $y >> 2a$. The charge $Q$ experiences an electrostatic force $F$. If $Q$ is now moved along the equatorial line to $P'$ such that $OP' = \frac{y}{3}$,the force on $Q$ will be close to: $\left( \frac{y}{3} >> 2a \right)$

DifficultJEE MAIN 2019

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Write the formulas for the electric field due to an electric dipole and the magnetic field due to a current-carrying loop at a point on their respective equatorial (bisector) lines at a distance $x$.

Medium

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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.

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Two electric dipoles of moment $P$ and $27 P$ are placed on a line with their centres $24 \,cm$ apart. Their dipole moments are in opposite directions. At which point between the dipoles, measured from the centre of the dipole of moment $P$, will the electric field be zero (in $\,cm$)?

Which of the following options is a pair of polar molecules?

Write the formulas for the electric field due to an electric dipole and the magnetic field due to a current-carrying loop at a point on their respective equatorial (bisector) lines at a distance $x$.

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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.