University Physics Supplementary Handout 1: Coulombís force

 

 

Consider the following point-like charges (charges that do not have structure (i.e zero size.Three charges 1 C, 2 C and -3 C are situated at the corners of a right triangle as shown.Find the net force on 1 C charge.

 

We first need to compute the magnitude of the forces F2, and F-3.††††††††† Distance needed for F-3 can be obtained from definition of sine,

 

opposite side = 10xSin (30) =10 (0.5) = 5 m

 

The total force is not 1.8x10+8+10.8x10+8 N. Because these forces are not in the same direction.We will find the total force by performing vector addition of F2 and F-3.