Explain with the help of two activities that current carrying wire produces magnetic field.
Answers
Answer:
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Explanation:
activity 1. Take a long straight copper wire, two or three cells of 1.5 V each, and a plug key. Connect all of them in series.
Place the straight wire parallel to and over a compass needle.
Plug the key in the circuit.
Observe the direction of deflection of the north pole of the needle. If the current flows from north to south towards the east.
Replace the cell connections in the circuit. This would result in the change of the direction of current through the copper wire, that is, from south to north.
Observe the change in the direction of deflection of the needle. You will see that now the needle moves in opposite direction, that is, towards the west. It means that the direction of magnetic field produced by the electric current is also reversed.
activity 2. Take two different coils of copper wire having large number of turns (say 50 and 100 turns respectively). Insert them over a non-conducting cylindrical roll, (You may use a thick paper roll for this purpose.)
Connect the coil-1, having larger number of turns, in series with a battery and a plug key. Also connect the other coil-2 with a galvanometer.
Plug in the key. Observe the galvanometer. Is there a deflection in its needle? You will observe that the needle of the galvanometer instantly jumps to one side and just as quickly returns to zero, indicating a momentary current in coil-2.
Disconnect coil-1 from the battery. You will observe that the needle momentarily moves, but to the opposite side. It means that now the current flows in the opposite direction in coil-2.