Astyrofoam ball of mass 0.120 g is placed in an electric field of 6000 n/c pointing downward. what charge must be placed on the ball for it to be suspended?

Explanation:

In order for the ball to be suspended, the electric force on it must be equal to the weight of the ball, so we can write:

where

qE is the electric force

mg is the weight

q is the charge on the ball

E = 6000 N/C is the electric field

is the mass of the ball

is the acceleration of gravity

Solving for q, we find the magnitude of the charge:

Now we have to determine the direction. We know that:

- The weight points downward, so the electric force must acts upwnward

- The electric field points downward: so, F and E have opposite directions

- This means that the charge is negative

So, the answer is

overcharge is the right answer system