Find the time required for the electron to move from a to b

Question

An electron at point A in the figure (Figure 1) has a speed of 1.45x 10⁶m/s .

Part A

Find the direction of the magnetic field that will cause the electron to follow the semicircular path from A to B .

Part B

Find the magnitude of the magnetic field that will cause the electron to follow the semicircular path from A to B .

Part C

Find the time required for the electron to move from A to B.

Part D

Find the direction of the magnetic field, that would be needed if the particle were a proton instead of an electron?

Part E

Find the magnitude of the magnetic field, that would be needed if the particle were a proton instead of an electron?