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  4. Figure shows the field lines of a positive point charge. The work done by the field in moving a small positive charge from Q to P is <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/edb201d758cfb67302138fc36d224400-.png />

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Q. Figure shows the field lines of a positive point charge. The work done by the field in moving a small positive charge from $Q$ to $P$ is
image

Electrostatic Potential and Capacitance

Solution:

In moving a small positive charge from $Q$ to $P$, work has to be done by an external agency against the electric field. Therefore, work done by the field is negative.