`AB` is a resistanceless conducting rod which forms a diameter of a conducting ring of radius `r` rotating in a uniform magnetic field `B` as shown in figure. The resistance `R_(1)` and `R_(2)` do not rotate. Then the current through the resistor `R_(1)` is
A. (a) `(Bomegar^(2))/(2R_(1)
B. (b) `(Bomegar^(2))/(2R_(2)`
C. (c ) `(Bomegar^(2))/(2R_(1)R_(2))(R_(1) + R_(2))`
D. (d) `(Bomegar^(2))/(2(R_(1)+ R_(2))`