my question is about #2... I know the answer I just wanna know why that\'s the a

Question

my question is about #2... I know the answer I just wanna know why that's the answer

Review I PH 106 If the force between two proto is 10 N at a separation of d, what will the force be when they a distance 3d apart? (e) 1.1N (d) 3.3N (a) 90N (b) 30N (c) 10N corners of a 2. Point charges q +2HC, q2 +4pC, and -3 are located at the on square of 0.2m as shown. What is the magnitude of the net electrical force exerted side charge (a) 4.5N (b) 0.9N (c) 3.2N (d) 0.64N (e) 0.0N 3. The closed surface S surrounds two point charges q +q and q3 -q. hat is the net flux leaving this surface? (a) zero (b) qleo (c) -q/eo (d) 2q/go surface S. (e) The answer depends on the shape and size of the 4. Two concentric, hollow, conducting spherical shells carry charges of Q1- +3HC (inner shell) and Q2 -8HC (outer shell). What is the net charge on the outside surface the larger sphere?

Explanation / Answer

Apply Columb's law to solve problem

F = k q1 q2/ r^2

Apply Columb law between 4 uC and 3 uC

F43 = 9 * 10^9 ( 4 * 10^-6) ( 3 * 10^-6)/0.2^2 = 2.7 N i

Apply Columb law between 4 uC and 2 uC

F42 = 9 * 10^9 ( 4 * 10^-6) ( 2 * 10^-6)/0.2^2 =- 1.8 N j

magnitude of force

F = sqrt ( F43)^2 + ( F42)^2

= sqrt ( 2.7)^2 + (-1.8)^2 = 3.2 N

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