three point charges are located on the x-axis. The 1st charge, q1 = 10 µC, is at

Question

three point charges are located on the x-axis. The 1st charge, q1 = 10 µC, is at x= -1.0m; the second charge, q2 = 20 µC, is located at the orgin; and the third, q3 = -30 µC, is located at x = 2.0 m. Which charge is subjected to the net force of greatest magnitude?
a) q1
b) q2
c) q3
d) q1 and q2 (equal)
e) q2 and q3 (equal)

If more field lines leaves a closed surface, than enter that surface, then
a) a net positive charge is contain inside the surface
b) a net negative charge is contain inside the surface
c) an error has been made since the number of field lines entering a surface must be equal those leaving the surface
d) an operating electron gun is inside the surface
e) there must be a charge on the surface

Explanation / Answer

The force between charges q1 and q2 is

The force between charges q2 and q3 is

The force between charges q3 and q1 is

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