Homework Answers
For the electron to move from point A to point B, it would follow a circular path of radius 20/2 =10cm i.e. r=0.1m.
Now use the formula r=mv/qB where,
m=mass of electron=9.1*10^(-31) kg
v=velocity given=10^(7) m/s
q=charge on electron=1.6*10^(-19) C
Therefore required magnetic field B=mv/rq
After substituting the above values and calculating them we will get B=0.00056875 Tesla or 5.6785 Gauss
For the direction use Fleming's left hand rule.
The middle finger of your left hand gives the direction of current which is opposite to that of electron. Your thumb will give the direction in which the electron needs to go that is downwards. Place them along these directions and you will find your index finger giving the required direction of magnetic field which will be into the plane of the paper.
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