A uniform magnetic field is directed into the page. A charged particle, moving in the plane of the page, follows a clockwise spiral of decreasing radius as shown. A reasonable explanation is:
The current is from left to right in the conductor shown. The magnetic field is into
the page and point S is at a higher potential than point T. The charge carriers are:
The diagram shows a straight wire carrying a flow of electrons into the page. The wire is between the poles of a permanent magnet. The direction of the magnetic force exerted on the wire is:
A square loop of wire lies in the plane of the page and carries a current I as shown.
There is a uniform magnetic field B parallel to the side MK as indicated. The loop will tend to rotate: