Question

A uniform electric field is directed downward and has a magnitude of 5 N/C. find the magnitude and direction of the force experienced by a charge of -6C plaved in this field.

Answer 1

We can find the magnitude of the electric force from the formula:

$$F=qE=5\ \dfrac{N}{C}\cdot6\ C=30\ N.$$

As we can see from the condition of the question, the uniform electric field is directed downward. As we know, if a negative charge is placed in the electric field, the electric force will be directed in the opposite direction to the electric field (upward).

Answer:

$F=30\ N,$ upward.