Assertion (A) The work done by the electrostatic force is zero when a point charge move in a circular path around another charge.
Reason (R) The dot product of force and displacement vectors gives work done.

Options

A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
B. Both (A) and (R) are correct but (R) is not correct explanation of (A)
C. (A) is correct but (R) is not correct.
D. (A) is not correct but (R) is correct.

Answer

A

Explanation

`:.` Work done, W =F .s = Fs cos `theta`
work done is zero when acts at right angle to the direction of motion of charges hence,
`W = Fs cos 90^(@)` =0 . The work done by the electrostatic force is zero when a point charge moves in a circular path around charge.
Since, the electrostatic force acts at right angle to the direction of motion of the charges.