Figure 21-15 shows two charged particles on an axis. The charges are free to mov

Question

1. Find the location of the third charge (q3) from q1 at equilibrium.
2. Find the charge of the third particle, in terms of q.

Explanation / Answer

----------0-------------------0-------------

-5q -q

(a) The only place in which the two negative charges can exert a

force to cancel each other out is in between the two negative charges.

(b) Again, the only charge that can produce a net force of zero in between is a positive

charge.

(c) The equilibrium is unstable. If the positive charge is displaced in either direction, it will

not return to the equilibrium point, much like a a car on the top of a hill will not return to

the top of a hill once nudged o

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