Three point charges are placed at distances of d, 2d, and 3d from a point P. The

Question

Three point charges are placed at distances of d, 2d, and 3d from a point P. The particle that is 2d away from P has a charge of -2q. From the options given, assign charges to the remaining two point charges such that the potential at point P is zero.

Question 4 of 8 Map sapling leaming Three point charges are placed at distances of d, 2d, and 3d from a point P. The particle that is 2d away from P has a charge of -2q. From the options given, assign charges to the remaining two point charges such that the potential at point P is zero. +9q 3d 15.54 -3q -13.5q 2d -2q

Explanation / Answer

0 = k(q1/d - 14q/2d + q3/3d) k cancels
7q/d = q1/d + q3/3d multiply by 3d
21q = 3q1 + q3
We need a q1 and q3 such that the above is true.

It would be tough to make the ones with decimals work -- toss them.
I like 5q and 6q:
21q = 3*5q + (6q) is true.
So q1 = 5q
and q3 = 6q

Hope this helps!

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