3. You are provided with a magnetic compass, an empty matchbox, a battery, a key, some insulated copper wires and connecting wires. Using these materials, how will you make a tester for testing an electric circuit? Draw the necessary diagrams.
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Explanation:
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.
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