Measurement of Low Resistance

Q. The resistance values of the bridge circuit shown in figure are $R_1=R_2=R_3=R\text{and}{R}_4=R+\Delta R.$ The bridge is balanced by introducing a small voltage v. The value of $\Delta R$ is

1. $\frac{RV}{E}$
2. $\frac{RV}{E-V}$
3. $\frac{2RV}{E-2V}$
4. $\frac{RV}{E+2V}$

Q. A kelvin double bridge is best suited for the measurement of

1. inducatance
2. capacitance
3. low resistance
4. high resistance

Q. In the context of low resistances, identify the INCORRECT statement

1. standard low resistances have four terminal construction.
   
2. Kelvin bridge is used for measuring low resistance, precision depends on the detector sensitivity.
3. A pair of ratio arms in Kelvin bridge for measuring the low resistance eliminates the error due to thermo emf.
4. low resistances used for ammeter shunts are usually made with a suitable number of plates of large area and all the plates connected in parallel.