CBSE Class 10 Answered

You can determine the direction of the magnetic field on a wire by imaging your right thumb pointing in the direction of the current. The fingers of your right hand will wrap around the wire in the same direction as the magnetic field. With two currents flowing in opposite directions you can determine that the magnetic fields are in the same direction and will therefore repel. When the currents flow in the same direction the magnetic field will be opposite and the wires will attract.