Question

If the current is doubled, the deflection is also doubled in

Options

• a tangent galvanometer

• a moving-coil galvanometer

• both

• none

Answer 1

a moving coil galvanometer

The current and deflection dependence of a moving coil galvanometer is given by `i = k/(nAB)θ ⇒ i ∝ θ`

Therefore, if we double the current, the deflection also gets doubled.
However, in a tangent galvanometer, i ∝ tan θ;  that is, there is no direct relation between θ and current.
Hence, the correct option is (b).