Q. 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
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 to or 2 $Hz$
Explanation
(c) At low frequency of 1 to $2\ Hz$, oscillations may be observed as our eyes will be able to detect it
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.