Homework Help: pleaseeeee help - physics

Posted by ashley --- HELP PLEASEE!!! on Saturday, May 14, 2011 at 9:56pm.

Four charges are placed at the four corners of a square of side 15 cm. The charges on the upper left and right corners are +3 μC and -6 μC respectively. The charges on the lower left and right corners are -2.4 μC and -9 μC respectively. The net electric force on -9 μC charge is:
a. 5.1 x1011 N/C away from the proton
b. 5.1 x1011 N/C toward the proton
c. 5.1 x1010 N/C toward the proton
d. 5.1 x1010 N/C away from the proton

pleaseeeee help - physics - ashley --- HELP PLEASEE!!!, Saturday, May 14, 2011 at 10:14pm
is it towards the proton?
pleaseeeee help - physics - bobpursley, Saturday, May 14, 2011 at 11:26pm
I think it will be away from the proton...

I didn't do the math.

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