A point charge q is situated at a distance r on axis from one end of a thin conductiong rod of length L having a charge Q [uniformly distributed along its length]. The magnitude of electric force between the two is

Options

(a) KQq/r²
(b) 2KQ/r(r+L)
(c) KQq/r(r-L)
(d) KQq/r(r+L)

Correct Answer:

KQq/r(r+L)

Explanation:

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