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The Wheatstone bridge shown in figure, here, gets balanced when the carbon resistor used as R 1 has the colour code (Orange, Red, Brown). The resistors R 2 and R 4 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 R 3 , would be - R 1 R 2 R 4 R 3 + – G

1. Brown, Blue, Brown
2. Grey, Black, Brown
3. Red, Green, Brown
4. Brown, Blue, Black

Correct answer: Grey, Black, Brown

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