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Electrons move through a magnetic field of 3.0x10-3T balanced by an electric field of 2.4x10 N/C....

Electrons move through a magnetic field of 3.0x10-3T balanced by an electric field of 2.4x10 N/C.
a. What is the speed of the electrons?
b.If the electric field were produced by a pair of plates 0.50 cm apart, what would be the potential difference between the two plates?
c. If the electric field were removed, what would be the radius of the circular path that the electrons followed?
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