# Electric Force and Object Acceleration

• mli273
In summary, an object with a charge of -2.9 microC and a mass of .012 kg experiences an upward electric force, due to a uniform electric field, equal in magnitude to its weight.
mli273
1. An object with a charge of -2.9 microC and a mass of .012 kg experiences an upward electric force, due to a uniform electric field, equal in magnitude to its weight.

Part A: Find the magnitude of the electric field. Which I correctly calculated to be 4.1 x 10^4 N/C.

Part B: If the electric charge on the object is doubled while its mass remains the same, find the direction and magnitude of its acceleration.

2. F=ma

3. I'm not really sure how to calculate the acceleration of the problem. Any ideas?

What happens to the electric force if the charge is doubled? What happens to the net force on the object?

ΣF = ma

is the net force doubled as well?

mli273 said:
is the net force doubled as well?
What was the net force originally?

Net force was F=mg so F=(.012)(9.81)= .11772 N

you have two forces, gravity and the electric force due to the electric field.

You need to sum the all of the forces in your system (in the Y direction)

Electric Force = q*E

sum of the forces = 2qE - mg = ma; //solve for a

If the acceleration is greater in than gravity, than the direction is obviously ...

fizzynoob said:
you have two forces, gravity and the electric force due to the electric field.

You need to sum the all of the forces in your system (in the Y direction)

Electric Force = q*E

sum of the forces = 2qE - mg = ma; //solve for a

If the acceleration is greater in than gravity, than the direction is obviously ...

Ok, well a = [2(-2.9x10^-6)(4.1x10^4) - (.012)(9.81)]/.012 = -29.6 m/s^2

But this is not the correct answer according to Mastering Physics.

mli273 said:
Net force was F=mg so F=(.012)(9.81)= .11772 N
No, mg is just one of the forces on the object. What's the other? What's the net force?

Hint: To solve part B you won't need the result from part A.

Doc Al said:
No, mg is just one of the forces on the object. What's the other? What's the net force?

Hint: To solve part B you won't need the result from part A.

Oh..I get it. So it would be 2q -mg= ma, so the answer would be 9.81 m/s^2 & it's positive because the force is upward. Thank you so much!

## 1. What is electric force?

Electric force is a fundamental force of nature that describes the attraction or repulsion between charged particles. It is responsible for the flow of electrons in conductors and the interactions between atoms and molecules.

## 2. How does electric force affect object acceleration?

Electric force can cause an object to accelerate if the object has an electric charge. Depending on the direction and magnitude of the electric force, the object will either accelerate in the same direction as the force or in the opposite direction.

## 3. What is the relationship between electric force and object acceleration?

The relationship between electric force and object acceleration is described by Newton's Second Law of Motion, which states that the acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass.

## 4. Can electric force change an object's direction of motion?

Yes, electric force can change an object's direction of motion if the force is not acting in the same direction as the object's initial velocity. This change in direction is known as a change in the object's trajectory.

## 5. How is electric force measured?

Electric force is typically measured in units of Newtons (N). It can be measured using an instrument called an electrostatic force sensor, which can detect the attraction or repulsion between charged objects.

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