A dust particle through an electric field

[baker265]

Homework Statement

A small piece of dust of mass m = 3.8 mu or micro g (micrograms) travels through an electric air cleaner in which the electric field is 526 N/C. The electric force on the dust particle is equal to the weight of the particle.

(a) What is the charge on the dust particle?

Homework Equations

F=ma
q=F/E

The Attempt at a Solution

((3.8*10^-9)*9.81)/526=7.079*10^-11

 

[Curious3141]

Homework Statement

A small piece of dust of mass m = 3.8 mu or micro g (micrograms) travels through an electric air cleaner in which the electric field is 526 N/C. The electric force on the dust particle is equal to the weight of the particle.

(a) What is the charge on the dust particle?

Homework Equations

F=ma
q=F/E

The Attempt at a Solution

((3.8*10^-9)*9.81)/526=7.079*10^-11

Two things: 1) no. of sig figs you can give the result to and 2) lack of units. Other than that, looks right. Is there a question?

 

[baker265]

Okay, thanks! I just wanted to make sure I was doing it correctly.

 

[Simon Bridge]

What he said.
Always, please, show your reasoning and working.
Always ask a specific question so we don't have to guess what you want.

Oh... welcome to PF BTW.