# The deflection in a moving coil galvanometer is (1) Directly proportional to the torsional constant (2) Directly proportional to the number of turns in the coil (3) Inversely proportional to the area of the coil (4) Inversely proportional to the current flowing

Answer: (2) Directly proportional to the number of turns in the coil

A moving coil galvanometer is an instrument which is used to measure electric currents. It is a sensitive electromagnetic device which can measure low currents even of the order of a few microamperes.

Moving-coil galvanometers are mainly divided into two types:

• Suspended coil galvanometer
• Pivoted-coil or Weston galvanometer

For moving coil galvonometer

$$\begin{array}{l}theta = frac{NBAI}{k}\end{array}$$

Where,

• θ = Defelction of the galvanometer
• N = Number of turns
• B = Magnetic feild
• I = Current in the coils of the galvanometer
• k = Torsional constant of the spring