Calculating Mass Using Electric Field and Force Equations

AI Thread Summary
To calculate the mass of a particle with a charge of -6C suspended in an electric field of E=(0,0,-15) N/C, one must understand the relationship between electric force and gravitational force. The electric force can be calculated using F = qE, where q is the charge and E is the electric field strength. Since the particle is stationary, the electric force must equal the gravitational force acting on it, which is given by F = mg, where m is the mass and g is the acceleration due to gravity. By equating the two forces and solving for mass, the required mass can be determined. Understanding the notation and the relationship between these forces is crucial for solving the problem correctly.
krony23
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Homework Statement


In a laboratory, a particle of charge -6C is held stationary because it is placed in an electric field E=(0,0,-15)N/C which suspends it against gravity. What is the mass of the particle? Give answer in kg.

Homework Equations


I THINK
E= F/q
F= ma


The Attempt at a Solution


Ok, so I haven't actually had a chance to attempt this yet because A) I don't understand the notation of E in this equation, so I don't know if it is acceptable to just use -15 for E, and B) if I even have the right equations to use, I don't know what the acceleration is. Please help
 
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krony23 said:

Homework Statement


In a laboratory, a particle of charge -6C is held stationary because it is placed in an electric field E=(0,0,-15)N/C which suspends it against gravity. What is the mass of the particle? Give answer in kg.

It suspends it against gravity, so what is the relationship between the electric force and the mass?
 
I don't really get what that means about it though.
 
krony23 said:
I don't really get what that means about it though.

The only forces acting on the mass are its weight and the electric force. If it is being suspended, what is the resultant force on it?
 

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