Question

please help

Answer 1

Are you familiar with coulomb's law for the force between two point charges ?

Answer 2

Kind of... i mean thats what we're studying but i dont know how to apply it

Answer 3

do you need only answer?

Answer 4

It allows you to calculate the force felt by one charge due to another.
The thing to remember is that the force is a vector, so it has a direction as well as a magnitude.
If you look at the full statement of coulomb's law it tells you what the direction of the force is.
For part (a) of your question -
Suppose you consider the force on the bottom charge due to the upper left charge.
Draw the force given by coulombs law on your diagram.
Then work out the force on the bottom charge due to the upper right charge, and draw that force on the diagram.
All that is left to do is find the vector sum of the two individual forces to get the resultant force on the lower charge.

Answer 5

do you need only answer?

Answer 6

i still kind of don't understand

Answer 7

well i need the answer but id really like to know how to work it out @tony115

Answer 8

what does coulomb's law say about the direction of the force between two charges ?

Answer 9

you know about gravitational force?
electrostatic force is also one like that

Answer 10

but the differnce is it can change with medium and also can repellike charges

Answer 11

do you understand ,here all the charges give are like charges so they will repel each other
their force of repeltion is given by columb's law and it's direction is along the line joining the charges and away from the other charge