Homework Answers
a)
Charge
Q=2e=2*1.6*10-19=3.2*10-19C
By Conservation of energy
(1/2)mv2=qV
v=sqrt[2qV/m] =sqrt[2*3.2*10-19*3000/6.6*10-27]
v=5.3936*105 m/s
Here centripetal force is balanced by magnetic force
mv2/r =qvB
=>r=mv/qB =(6.6*10-27)(5.3936*105)/(3.2*10-19)(0.39)
r=0.02852384 m
r=0.0285 m
b)
Period
T=2pir/v =2pi*0.0285/5.3936*105
T=3.323*10-7 s
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