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To find the direction of the field produced, let us do the activity in the following way,
Steps:
- The following components are needed for this activity - Long straight copper wire, Two or three cells of 1.5 V each, and a plug key.
- Connect all the components in series, as shown in the below figure.
- Locate the straight wire parallel to and over a compass needle.
- Plug the key in the circuit.
- Note the direction of deflection of the north pole of the needle. As shown in the figure, if the current flows from north to south, the compass needle's north pole will move towards the east.
- Next, replace the cell connections in the circuit as shown in the below figure.
- This would result in the change of the current direction through the copper wire, that is, from south to north.
- Note the change in the direction of deflection of the needle.
You will see that now the needle moves in the , that is, towards the . It means that the direction of the magnetic field produced by the electric current is also.
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