An electron is moving in electric field and magnetic field it will gain energy from

What is specific charge ? Write its standard value.

Write dimensional formula and electron volt of electron volt. 

In Millikan’s oil drop experiment, an oil drop of mass $16 \times {10^{ – 6}}kg$ is balanced by an electric field of ${10^6}V/m.$ The charge in coulomb on the drop, assuming $g = 10\,m/{s^2}$ is

If an electron oscillates at a frequency of $ 1 GHz$  it gives