List of top Physics Questions on Electrical Instruments asked in MHT CET

A galvanometer of resistance $ 50\,\Omega $ is connected to a battery of $ 3 \,V $ along with a resistance of $ 2950\,\Omega $ in series. A full scale deflection of $ 30 $ divisions is obtained in the galvanometer. In order to reduce this deflection to $ 20 $ divisions, the resistance in series should be

When the temperature exceeds the transition temperature, a ferromagnetic material becomes similar to: