Question

Two coils P and Q are lying parallels and very close to each other. Coil P is connected to an AC source whereas Q is connected to a sensitive galvanometer. On pressing key K

• A. small variations are observed in the galvanometer for applied 50 Hz voltage
• B. deflections in the galvanometer can be observed for applied voltage of 1 Hz to 2 Hz.
• C. no deflection in the galvanometer will be observed
• D. constant deflection will be observed in the galvanometer for 50 Hz supply voltage

Answer 1

The correct option is B deflections in the galvanometer can be observed for applied voltage of 1 Hz to 2 Hz.

Upon connecting to the AC source , a current starts to flow in the coil P. This current induces a current in the galvanometer coil Q due to mutual inductance because of the flux linkages. This induced current causes a deflection in the galvanometer.