Question

(I) In the given circuit diagram, a battery B, a key K, a resistance R and a thick copper wire XY are connected in series and a compass is placed near the wire. What is the purpose of this arrangement?

(II) What conclusion do you draw from it?

Answer 1

1. This setup is used to demonstrate the magnetic effect of electric current, i.e., to show that a current-carrying conductor produces a magnetic field around it.
2. When current flows through the wire XY, the compass needle gets deflected, indicating the presence of a magnetic field. Thus, we conclude that electric current produces a magnetic field around a conductor.