An electron (charge ) is moving with velocity in the –direction while it passes…
PHYSICS · Multi-part · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
An electron (charge −e) is moving with velocity v=3.0×106ms−1 in the +x–direction while it passes through a region where a uniform magnetic field of magnitude 0.20T points in the +y–direction. Neglect all forces other than the magnetic force.
(a) Determine the magnitude of the magnetic force acting on the electron.
(b) Indicate whether the magnetic force points toward +z or −z.
(c) The magnetic field is now reversed so that it points in the −y–direction while the electron’s velocity is unchanged. State the new direction of the magnetic force and explain how you arrived at your answer.