HI PLEASE HELP ME ON PHYSICS URGEENTLY PLEASE 2) Two point charge of +2.0 MuC an

Question

HI

PLEASE HELP ME ON PHYSICS URGEENTLY PLEASE

2) Two point charge of +2.0 MuC and -6.0 MuC are located on the x-axis at x = -1.0 cm and x = +2.0 cm respectively. Where should a third charge of +3.0 MuC be placed on the +x-axis so that the potential at the origin is equal to zero? 3) A sphere with radius 2.0 mm carries +1.0 MuC of charge distributed uniformly throughout Its volume. What is the potential difference, VB ? VA, between point B, which is 4.0 m from the center of the sphere, and point A, which is 9.0 m from the center of the sphere?

Explanation / Answer

Part 1)

The formula for potential is V = kq/r, and we need the three values to cancel at the origin...

The two positives will equal the negative...

(9 X 109)(2 X 10-6)/(.01) + (9 X 109)(3 X 10-6)/r = (9 X 109)(6 X 10-6)/(.02)

r = .03

That is 3 cm (Choice A)

Part 2)

V = kq/r - kq/r

V = (9 X 109)(1 X 10-6)/4 - (9 X 109)(1 X 10-6)/9

V = 1250 V

With 2 sig figs, that is 1200 V (Choice B)

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