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 [CPMT 1986]

• 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