railway RRB JE (CBT I + CBT II) Mock Test 2024 Electrical and Electronics Measurements Measurement of R/L/C Using Bridge Circuits Measurement of Resistance
In Kelvin's double bridge, the unknown resistance is given by:
1
X = \(\rm\left[\frac{P}{Q} S+\frac{q r\left[\frac{P}{Q}−\frac{p}{q}\right]}{p+q+r}\right]\)
2
X = \(\rm\left[\frac{P}{Q} S−\frac{q}{p+q+r}\right]\)
3
X = \(\rm\left[\frac{p}{Q} S+\frac{q}{p+q−r}\right]\)
4
X = \(\rm\left[\frac{P}{Q} S−\frac{q r\left[\frac{P}{Q}−\frac{p}{Q}\right]}{p+q+r}\right]\)