An electron enters a magnetic field with speed v=1.41x10^6 m/s and emerges after moving in a semicircular path with a diameter 10cm. Find the magnitude and the direction of the magnetic field, and the time it took the electron to move on this path.
since electron moves in a circular path hence field must have been perpendicular to the direction of motion of the electron.
hence
q is the charge of electron
v is the velocity of electron
B magnetic field strenght
m is mass of electron
r is radius of the path
hence
B = perpendicular to the direction of motion of electron
time =
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