v36.3

A

`(r )/(sqrt(K))`

B

`(r )/(K)`

C

rK

D

`rsqrt(K)`

Text Solution

Verified by Experts

The correct Answer is:
A
`F_(1) = (1)/(4pi epsilon_(0))(q^(2))/(r^(2))` or `F_(2) = (1)/(4pi epsilon_(0)K)(q^(2))/(R^(2))`
as `F_(1) = F_(2)`, hence `(q^(2))/(r^(2)) = (1)/(K)(q^(2))/(R^(2)) :. R = r//sqrt(K)`
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