Homework Help: physics - electric field

Posted by J Velji on Monday, January 17, 2011 at 9:37pm.

a point particle with charge q= 4/5 uC is placed on the x-axis at x=-10cm. A second particle of charge Q is now placed on the x-axis at x = 25cm, and its found that the electric field at the origin is zero. Find Q.

physics - electric field - bobpursley, Monday, January 17, 2011 at 9:54pm
Etotal=E1+E2
0= kq1(-.1)/abs(-.1)^3 + kQ (.25)/abs(.25)^3 in vector form.

Q= q1*(.25/.1)^2
physics - electric field - J Velji, Friday, January 21, 2011 at 6:17pm
Yes, got it!

Thank you!

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