Question

425 x 1017 protons in t and carries a net charge (10%) Problem 3: of O -15 nC. Suppose a speck of dust in an electrostatic precipitator has 50% Part (a) Enter an expression for the number of electrons Ne in the speck of dust. Grade Deduct Potentia Submi Attemp (4eb pe detaile Submit Hint I give up Feedback: 0%deduction per feedback. Hints: 0%-deduction per hint. Hints remaining - ム5000 Part (b) How many electrons are in the speck of dust?

Answer 1

N_p = 4.25 times 10^17 q = 1.6 times 10^-19 N_e = ? q = -1.6 times 10^-19 N_p times q + N_e times q = -15 nc 4.25 times 10^17 times 1.6 times 10^-19 + N_e times -1.6 times 10^-19 = -15 times 10^-9 C 6.8 times 10^-2 N_e times 1.6 times 10^-19 = -1.5 times 10^-9 6.8 times 10^-2 - 1.5 times 10^-6 = N_e times 1.6 times 10^-19 N_e = 6.8 times 10^-2/1.6 times 10^-19 rightdoublearrow 4.25 times 10^17 Number of electrons is 4.25 times 10^17