if work done by electrostatic force on a system of point charges is positive then the potential energy of system will ?? increase or decrease

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Q. Assertion :If work done by conservative forces is positive, kinetic energy will increase. Reason: Here potential energy will decrease.

Q. Under the influence of electrostatic field of an unknown system of fixed charges, a 2C charge is moved from point C to D slowly. The change in potential energy of the system is 10 J. What is the work done by the mentioned conservative field in the process?

Choose the wrong statement

a) Work done in moving a charge on equipotential surface is zero.

b) Electric lines of force are always normal to equipotential surface.

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d) Electric lines of force diverge at positive charge and converge towards negative charge.

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