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# To Determine Resistance of a Galvanometer by Half-Deflection Method and to Find Its Figure of Merit - Physics Practical Class 12 Viva Questions with Answers

1. What is a galvanometer?

Answer: A galvanometer is a measuring device that measures a small electrical current or a function of the current by deflection of a moving coil.

1. What is the formula to calculate the figure of merit of the galvanometer?

Answer: The formula to calculate the figure of merit of the galvanometer is

$$\begin{array}{l} k=\frac{1}{\Theta }\frac{E}{R+G}\end{array}$$
.

1. What is an ammeter?

Answer. An ammeter is a measuring instrument used to calculate the current in a circuit.

1. What is the unit to measure electric current?

Answer: Ampere is the unit used to measure the electric current.

1. Define ampere.

Answer: An ampere is a unit of measure of the rate of electron flow or current in an electrical conductor.

1. How is a galvanometer converted to an ammeter?

Answer: A galvanometer is converted into an ammeter by connecting a low resistance in parallel with the galvanometer.

1. On the galvanometer scale, why is zero placed in the middle?

Answer: Zero is placed in the middle of the galvanometer since the galvanometer needle can deflect on both sides.

1. How is an ammeter connected in a circuit?

Answer: An ammeter should be connected in the series pattern with the circuit. When the ammeter is placed in series, the entire current of the circuit can be calculated when it passes through it.

1. Why is this method known as the half deflection method?

Answer: Here, the deflection is made half using a shunt resistance S. Hence It is known as the half deflection method.

1. Are there positive and negative terminals in the galvanometer?

Answer: There are no positive and negative terminals in the galvanometer.

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