A proton is released such that its initial velocity is from right to left across

Question

A proton is released such that its initial velocity is from right to left across this page. The proton's path, however, is deflected in a direction toward the bottom edge of the page due to the presence of a uniform magnetic field. What is the direction of this field? out of the page into the page from bottom edge to top edge of the page from right to left across the page A stationary positive charge +Q is located in a magnetic field B, which is directed toward the right as indicated. The direction of the magnetic force on Q is: toward the right. up. down. There is no magnetic force. There is a magnetic force on a particle. It is possible that the particle is: uncharged. stationary. moving in the direction of the magnetic field. not part of a wire. A current in a long, straight wire produces a magnetic field. The magnetic field lines: go out from the wire to infinity. come in from infinity to the wire. form circles that pass through the wire. form circles that go around the wire. The magnetic domains in a non-magnetized piece of iron arc characterized by which orientation? parallel to the magnetic axis anti-parallel (opposite direction) to the magnetic axis random perpendicular to the magnetic axis A current in a solenoid with N turns creates a magnetic field at the center of that loop. The field strength is directly proportional to: number of turns in the loop. current strength. Both choices A and B arc valid. None of the above are valid.

Explanation / Answer

7) Into the page. Refer to equation F=qv x B and the right hand rule. x is cross product. point fingers in direction of motion, thumb in direction of resultant force and fingers curl in direction of magnetic field. 8) Again, use equation F=qv x B, since there is no velocity for the particle there is NO magnetic force. 9) If there is a magnetic force there has to be a charge, it can't be stationary (stationary is v=0), and because of the cross product in F = qv x B means a particle traveling in the direction of the field can't experience a force (greatest magnetic force is experience when the motion is perpendicular to field). So, that leaves d. 10) d. Point thumb in direction of current along wire and curl fingers to show direction of magnetic field. See Ampere's law. 11) c. Magnetism is characterized by having aligned domains. Iron is a ferromagnetic material, that when non-magnetized has random moments such the net magnetic field is zero. 12) c. B = [(mu) N I]/L where N is number of turns and I is the current.

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