If the electric field is directed d) upward
Explanation:
In order for a positively charged particle to be suspended at rest, the electric force due to the electric field must be
1) equal in magnitude, and
2) opposite in direction
to the force of gravity acting on the particle. Since the force of gravity acts downward, the electric force must be upward. The electric force on a charged particle is given by
[tex]F=qE[/tex]
where
q is the charge
E is the electric field
And the direction of the force is:
Here we have a positive charge, therefore the direction of the electric field must be the same as the direction of the force, therefore upward.
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