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In the figure below, a particle moves along a circle in a region ofuniform magne

ID: 1667470 • Letter: I

Question

In the figure below, a particle moves along a circle in a region ofuniform magnetic field with magnitude B. The particleis either a proton or an electron (you must decide which based onthe figure). It experiences a magnetic force ofmagnitude F. Whatare (a) the particle'sspeed, (b) the radius of the circle,and (c) the period of the motion? Thecharge of an electron is -e and its massis me. The charge of a protonis e and its massis mp. State your answers in terms of thegiven variables
pict_28_24.gif
pict_28_24.gif

Explanation / Answer

the particle is a electron from the figure a)given that F=qvB=e*V*B hence V=F/eB b)radius of the circle=mv/qB=mF/(eB)2 c)=qB/m   T=2m/qB