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## Homework Statement

Points A and B are 4.8cm and 7.2cm away from a point charge of -6.2[tex]\mu[/tex]C at point C. AC and CB are at right angles.

a. How much work must be done in moving a 2.0x10^-12C charge from A to B

b. what is the potential difference between points A and B?

Ive been working at this problem with a friend for about a half hour. I have No idea what to do. Everything we tried failed.