Determine the direction of the force (if any) that will act on the charge in each of the following situations. a positive charge within an electric field that points to the left. a negative charge within an electric field that points upward. a positive charge moving into the screen in a magnetic field that points upward. a negative charge moving to the left in a magnetic field that points into the screen. a positive charge moving upward in an electric field that points out of the screen. a positive charge moving downward in a magnetic field that points upward.

-force  left  - force down,  - force the right  - force up  -force exiting screen  -force ZERO

Explanation:

The force for the electric and magnetic fields is given by the equations

       F = q E            (1)

       F = q v x B      (2)

Let's analyze each situation

- Positive charge electric field on the left. From equation 1, we see that the force goes to the left

- Negative charge electric field up, force down,

- Positive charge move towards the magnetic field screen up, we apply the law of the right hand, force the right

- Negative charge move left magnetic field towards the screen force up

- Positive charge moves up electric field exiting screen, force exiting screen

- Positive charge moves magnetic field down, force ZERO speed and parallel field

a and c

c is 100% but i am confused in a