I can make little droplets of oil with mass 3.2 Times 10^-15 kg, and various amo

Question

I can make little droplets of oil with mass 3.2 Times 10^-15 kg, and various amounts of electric charge. If I want a droplet with the charge of 7 electrons to just hover motionless in between two horizontal plates separated by 1.5 cm, how big must the voltage across the plates be? The Sun is a mass of incandescent gas, where Hydrogen is fused into Helium, at a temperature of millions of degrees. If four Hydrogen nuclei (each has a mass of 1.007276 u), fuse into one^4 He nucleus (mass 4.002603 u) in each fusion reaction, and the sun's energy output is 384.6 Times 10^24 Watts (384.6 yottawatts), how many such reactions must happen each second?

Explanation / Answer

gravitatioanl force must be balanced by electric force
m*g = q*E
m*g = q*V/d
3.2*10^-15 * 9.8 = (7*1.6*10^-19)*V/(1.5*10^-2)
V = 420 V
Answer: 420 V

i am allowed to answer only 1 question at a time

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