The figure below shows protons in a constant magnectic field which follow the ci

Question

The figure below shows protons in a constant magnectic field which follow the circular path shown in red. We are looking down from above with east pointing right as you would look at a map along the standard x axis and north pointing along the standard y axis. In the figure, R=6.80 cm and B=0.520 T.

In what direction is the protons moving in? Counterclockwise

If an electric field were introduced in the same region perpendicular to the magnetic field, what strength of electric field could make the protons' paths straight?
V/m

Explanation / Answer

Direction of speed according to right hand rule will be towards the north (ans)

b) Value of E

qE = qVB

E =VB

& as R =mV/qB

V=qBR/m

E =qB^2*R/m = 1.6*10^(-19) * 0.52*0.52*6.8/100*1.8*10^(-27) =1634417.77 N/C (ans)

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