In a uniform ring of resistance `R` there are two points `A` and `B` such that `/_ ACB = theta`, where `C` is the centre of the ring. The equivalent resistance between `A` and `B` is

Options

A. `(R(2pi-theta))/(4pi)`
B. `(R theta)/(2pi)`
C. `R(1-(theta)/(2pi))`
D. `(R )/(4pi^(2))(2pi-theta)theta`

Answer

D