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Electrostatics question

2005 · Q171
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Electrostatics question

2005 · Q171

NEETPhysicsElectrostaticsMCQ+4 / −1
As per the diagram a point charge +q is placed at the origin O. Work done in taking another point charge −-−Q from the point A [coordinates (0, aaa)] to another point B

AIPMT 2005 Physics - Electrostatics Question 39 English
  1. A
    zero
  2. B
    (qQ4πε01a2).2a\left( {{{qQ} \over {4\pi {\varepsilon _0}}}{1 \over {{a^2}}}} \right).\sqrt 2 a(4πε0​qQ​a21​).2​a
  3. C
    (−qQ4πε01a2).2a\left( {{{ - qQ} \over {4\pi {\varepsilon _0}}}{1 \over {{a^2}}}} \right).\sqrt 2 a(4πε0​−qQ​a21​).2​a
  4. D
    (qQ4πε01a2).a2\left( {{{qQ} \over {4\pi {\varepsilon _0}}}{1 \over {{a^2}}}} \right).{a \over {\sqrt 2 }}(4πε0​qQ​a21​).2​a​
View written solutionFree

Correct answer: A

Work done is equal to zero because the
potential of A and B are the same = 14πε0qa{1 \over {4\pi {\varepsilon _0}}}{q \over a}4πε0​1​aq​

AIPMT 2005 Physics - Electrostatics Question 39 English Explanation

No work is done if a particle does not change its potential energy.
i.e. initial potential energy = final potential energy.

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