defence exam ITBP (Telecommunication) Head Constable Mock Test 2024 Physics Current, Resistance and Electricity Potentiometer
The potential gradient of a potentiometer is 3 mV/cm. It is used to measure the potential difference across a resistance of 20 Ω. If a length of 60 cm of the potentiometer wire is required to get the null point, then the current passing through the 20 Ω resistor is:
1
8 mA
2
9 mA
3
10 mA
4
11 mA