Question

(1)(please answer all 2 questions and thank you)

The value of e 2 / ( 4 π ϵ 0 ) in SI units is __A__ × 10 − 30                            [ Select ]                       ["C", "N C^2", "N m^2", "N/m^2"]         .

From previous question: __A__ =

(2)

The net charge of 2.0 k g of electrons is __A__C.

The net charge of 2.0 k g of protons is __B__C.

The net charge of 2.0 k g of neutrons is __C__C.

From previous question: __A__ =

From previous question: __B__ =

From previous question: __C__ =

Answer 1

1) Value of

e = value of charge on one electron = 1.6 x 10^-19 C

So, putting above values in , we get 230.4 x 10^-30 Nm²

value of A is 230.4

Unit of is Nm²

2) 2 kg of electrons contains 2 x 10³⁰ electrons as mass of an electron is 9.1 x 10^-31kg

so, net charge on it A= - (2 x 10³⁰ )(1.6x10^-19)= - 3.2 x10¹² C

2 kg of protons contains 12 x 10²⁶ protonss as mass of a proton is 1.67 x 10^-27 kg

so, net charge on it B= + (12 x 1026 )(1.6x10^-19)= + 19.2 x10⁷ C

Neutron has no charge, so C=0