Can someone answer these questions in detail thanks Part A1 A Alma diameter drop

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Can someone answer these questions in detail thanks

Part A1 A Alma diameter drop of oil is suspended between two parallel electrodes that are spaced by 14mm. To suspend the droplet motionless, we need to hold the top electrode 25V more positive then the bottom electrode. The oil has a density of 885kg/m3 (a) Find the drops mass (b) What is the drops charge? (c) Does the droplet have a surplus or deficit of charge? Part A2 Imagine an electron trapped in a potential well along the x axis. The well is of finite depth. You can not raise or lower the potential, but you can shrink or expand the x-dimension of the well. What is your best strategy to hold the electron as long as possible? Part B (Advanced) A Classical atom orbiting at frequency f would emit electromagnetic waves of frequency f because the electron orbit seen edge on, looks like an oscillating electric dipole (a) At what radius would the electron orbiting the hydrogen atom emit light at A 700mm (b) at is the total mechanical energy of the system?

Explanation / Answer

a)    Drop mass = 0.6 * 10-6 * 885

                           = 5.31 * 10-4 kg

b)     Here, qE   = mg

=>   q = 5.31 * 10-4 * 9.81/1785.71

           = 2.917 microC

c) Surplus charge .

Part A2)    Expand the x dimension of well .

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