The diagram below shows two coils A and B placed parallel to each other at a very small distance. Coil A is connected to an AC supply. G is a very sensitive galvanometer. When the key is closed

Options

A. Constant deflection will be observed in the galvanometer for 50 Hz supply
B. Visible small variations will be observed in the galvanometer for 50 Hz input
C. Oscillations in the galvanometer may be observed when the input ac voltage has a frequency of 1 to 2 Hz
D. No variation will be observed in the galvanometer even when the input ac voltage is 1 or 2 Hz

Answer

C

Explanation

At low frequency of 1 to 2Hz, oscillations may be observed as our eyes will be able to detect it.