Which of the following pairs of instruments are null instruments? A. Ammeter and voltmeter B. The charge selector and triple beam balance C. Potentiometer and centre-zero galvanometer D. The Wheatston

SECTION 1: Questions 1 - 35

1. Which of the following pairs of instruments are null instruments?
A. Ammeter and voltmeter
B. The charge selector and triple beam balance
C. Potentiometer and centre - zero galvanometer
D. The Wheatstone bridge circuit and the spring balance

• A null instrument is one that measures a quantity by balancing it against a known quantity, indicating a zero (null) deflection when balanced.
• A potentiometer is a null instrument used to measure potential differences. It relies on a centre-zero galvanometer to detect the null point (zero current).
• A Wheatstone bridge is also a null instrument used