1. In the formula F=qvXB:
A. F must be perpendicular to v but not necessarily to B
B. F must be perpendicular to B but not necessarily to v
C. v must be perpendicular to B but not necessarily to F
D.all three vectors must be mutually perpendicular
E.none of the above

2. Units of a magnetic field might be:

3. The magnetic force on a charged particle is in the direction of its velocity if:
A.it is moving in the direction of the field
B.it is moving opposite to the direction of the field
C.it is moving perpendicular to the field
D.it is moving in some other direction

4. A magnetic field CANNOT:
A.exert a force on a charge
B.accelerate a charge
C.change the momentum of a charge
D.change the kinetic energy of a charge


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:

A.the charge is positive and slowing down
B.the charge is negative and slowing down
C.the charge is positive and speeding up
D.the charge is negative and speeding up
E.none of the above


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:

E.moving near the speed of light


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. up
B. down
C. to the left
D. to the right
E.into the page


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:

A.about PQ with KL coming out of the page
B.about PQ with KL going into the page
C.about RS with MK coming out of the page
D.about RS with MK going into the page
E.about an axis perpendicular to the page

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