# Direction and magnitude of the net electrostatic force

Find the direction and magnitude of the net electrostatic force exerted on the point charge q2 in Figure 19-31. Let q = +1.8 µC and d = 41 cm.
Direction ° (from the x-axis, which points to the right)
Magnitude N
*image of diagram*
http://www.webassign.net/walker/19-31.gif

i have found the components of all the charges, but dont know where to go after i get them, any help?

Astronuc
Staff Emeritus
Pick one charge, and figure the magnitude and direction for the attraction or repulsion of the other three charges.

The electrostatic force (vector) is along the line between each charge.

The net force (vector) on one charge is the sum of the forces (vector) due to the three other charges.

Remember - this is vector addition.

In the diagram, q2 (-) is attracted to q1 (+), but repelled by q3 (-) and q4 (-), along the lines between each charge.

You need to choose a frame of reference, use Coulomb's Law and the principle of superposition (the total force exerted on q2 is sum of the forces exerted by each separate particle)...

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