Question

You are provided with a magnetic compass, an empty match box, a battery of two cells and connecting wires. Using these objects how will you make a tester for testing an electric circuit? Draw the necessary circuit diagram and explain.

Answer 1

To make a tester of magnetic compass needle, take a matchbox. wrap an electrical wire a few times around the matchbox.

place a small compass needle inside it. now connect one free end of the wire to a terminal of two cell battery. from the other terminal of battery connect another wire. now tester with two free ends of wire is ready.

Principle of working:

when current flows in a wire, a compass needle gets deflected.in other words current carrying wire produces magnetic field around it.