Answer to Question #95004 in Electricity and Magnetism for Marwa Awad

Question

Suppose the charge on the electron and proton did not
have the same magnitude but instead differed by one part in 10^10. What would be the net charge on a 1.0 kg of the helium sample

Answer 1

The total number of electrons per He molecule is equal to 2.

The number of moles in 1.0 kg of the helium sample is equal to

$\frac{1000}{4}=250$

The number of molecules of He in sample is equal to

250×6.02×10²³=1.5×10²⁵

The number of electrons in 1 kg of the helium sample is equal to

2×1.5×10²⁵=3×10²⁵

The total charge of those electrons is

3×10²⁵×(-1.6×10^-19)=-4.8×10^-6 C

Answer

-4.8×10^-6 C