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Using the setup provided to you in the laboratory to determine (e/m) of the electron, the...

Using the setup provided to you in the laboratory to determine (e/m) of the electron, the accelerating potential (V), the applied magnetic field (B), the radius of circular path of the electrons (r), the electronic charge (e) and the electronic mass (m) are related by the following equation.
Select one:
a.2m(V.V) = e(r.r)B
b.2mV= e(r.r)(B.B)
c.2mV= e(r.r)B
d. 2mV= (e.e)(r.r)B

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