Suppose a speck of dust in an electrostatic precipitator has N_p = 3.75 × 10¹⁷ protons in it and carries a net charge of Q = -83 nC. Let q_e represent the charge of an electron.

 

Part (a)  Enter an expression for the number of electrons N_e in the speck of dust in terms of the charge of an electron, q_e, and other variables from the problem statement.

 

 

Part (b)  How many electrons are in the speck of dust?