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Electrostatics

JEE Main level, single correct, medium

237 of 311

Question 237 of 311

Three charges $+2 q,+3 q$ and $-4 q$ are situated at $(0,-3 a),(2 a, 0)$ and $(-2 a, 0)$ respectively in the $x y$ plane. The resultant dipole moment about origin is $\_\_\_\_$ .

Show answer and solution

Answer: (A) $2 q a(7 \hat{i}-3 \hat{j})$

The dipole moment is given by:

\vec{p} = q_1\vec{r}_1 + q_2\vec{r}_2 + q_3\vec{r}_3

\vec{p} = (2q)(-3a)\hat{j} + (3q)(2a)\hat{i} + (-4q)(-2a)\hat{i}

\vec{p} = -6qa\hat{j} + 6qa\hat{i} + 8qa\hat{i}

\vec{p} = 14qa\hat{i} - 6qa\hat{j}

\vec{p} = 2qa(7\hat{i} - 3\hat{j})

JEE Main question paper PDF

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JEE Main 2025 Apr 2 Shift 1 question paper

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JEE Main Physics practice question on Electrostatics (Electric Dipole), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.

Three charges +2q,+3q+2 q,+3 q+2q,+3q and −4q-4 q−4q are situated at (0,−3a),(2a,0)(0,-3 a),(2 a, 0)(0,−3a),(2a,0) and (−2a,0)(-2 a, 0)(−2a,0) respectively in the xyx yxy plane. The resultant dipole moment about origin is ____\_\_\_\_____.

JEE Main question paper PDF

More Physics practice

Three charges $+2 q,+3 q$ and $-4 q$ are situated at $(0,-3 a),(2 a, 0)$ and $(-2 a, 0)$ respectively in the $x y$ plane. The resultant dipole moment about origin is $\_\_\_\_$ .