Connect the circuit as shown in figure Connect a copper wire, thicker and straight as compared to the connecting wires, between A and B. Keep a magnetic needle adjacent to the wire. Keep the plug key open in the circuit and observe the direction of the needle. Close the plug key and observe the direction of the needle. What do you notice? Now interchange the connecting wires connected to the cell and observe the direction of the magnetic needle. Do you notice any relation between the direction of current and position of the needle?

What do you learn from this experiment?

Explanation

The magnetic effect is observed because of the current in the wire. This means electricity and magnetism are closely related! Also, if a magnet is moved and kept moving, we will observe electric effect.