Electric Charges, Electric Forces and Electric Fields

[hirschy]

Homework Statement

An object with a net charge of 24 x 10^-6 Coulombs is placed in a uniform electric field of 610 N/C, directed vertically. What is the mass of this object if it floats in this electric field?

Homework Equations

Felectric = kC (q*q/r^2)
Electric Field= kC (q/r^2)
E= Felectric/q
F=ma

The Attempt at a Solution

I know I need to use F=ma, but I do not know the acceleration. I don't know how to solve this

 

[Noein]

Which formula can be used to find the strength of the electric force due to the field?

 

[hirschy]

Electric field = Electric force/ q (charge of object)

 

[hirschy]

(Electric field equals the electric force divided by the charge of the object)

 

[Noein]

Once the electric force is calculated, it must be equal to the gravitational force since the charge is floating. What formula is used to calculate the gravitational force acting on a mass?

 

[hirschy]

F= mg

 

[hirschy]

Force of gravity = mass x 9.8

 

[Noein]

Bingo

 

[hirschy]

Wow thanks! haha I may have some more questions soon too :)