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July 3, 2015

Homework Help: physics

Posted by tv on Monday, January 11, 2010 at 2:55am.

10. The following three point charges are placed on the x axis: +5.0 mC at x=0; +4.0 mC at x= -40 cm; and +6.0 mC at x= +80 cm. Find (a) the electric field magnitude and direction and (b) the electric potential at x= +10 cm.



a) E = k(5E-6)/.102 +k(4E-6)/.502 - k(6E-6)/.702 = +4.5E6 N/C (in +x direction)

I was just wondering, how did the teacher get .102, .502 and .702 as the radius's.

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