When a current passes through a copper wire placed between points X and Y and a compass is placed near it, what do you observe?
How does the compass needle react before and after the current is switched on? What does this indicate about the magnetic effect of an electric current?
How does the compass needle react before and after the current is switched on? What does this indicate about the magnetic effect of an electric current?
Electric circuit
We observe that the needle is .
What does it mean?
It means that the electric current flows through the copper wire have .
Thus, we can state that .