The Wheatstone bridge shown in figure here, gets balanced when the carbon resistor used as R1 has the colour code (Orange, Red, Brown). The resistor R2 and R4 are 80 Ω and 40 Ω, respectively. Assuming that the colour code for the carbon resistors gives their accurate values, the colour code for the carbon resistor, used as R3, would be
1) Brown, Blue, Brown
2) Brown, Blue, Green
3) Red, Green, Brown
4) Grey, Black, Brown
