1. What is the speed of a beam of electrons when the simultaneous influence of an electric field of 1.56 \times 10^{4}\;{\rm V/m} and a magnetic field of 4.62 \times 10^{-3}\;{\rm T}, with both fields normal to the beam and to each other, produces no deflection of the electrons? (v= ? m/s)

2.When the electric field is removed, what is the radius of the electron orbit?

3.What is the period of the orbit?


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