Multiple choice [20 points I. When rubbing two insulators together, the one that

Question

Multiple choice [20 points I. When rubbing two insulators together, the one that gets a positive charge has had (A) protons added. (B) protons removed. (C) electrons added. (D) electrons removed 2. When an object is polarized, it (A) must contain more positive charge than negative charge (B) must contain more negative charge than positive chargse (C) will have a separation of positive and negative charge. (D) must be made of metal. 3. Doubling both charges changes the potential energy for a pair of point charges by a factor of (A) 2 (B) 4 4. A thin spherical shell of radius 0.20 nm has 5 × 10-6 C of charge uniformly distributed over its surface. What is the electric field 0.10 m from the center of the sphere? (A) 0 N/C (B) 1.125 x 10s N/C inward. (C) 2.25 × 106 N/C outward. (D) 4.5 × 106 N/C outward. 5. Three point charges (n,92, 3) are arranged so the potential energy for the pair of and g2 is 0.12 J, and for the pair gz and gs is 0.23 J. If the total potential energy of the arrangement is 0.60 J, what is the potential energy of the gi and gs pair? (A) 0 J (B) 0.11 J. (C) 0.25 J (D) 0.35 J. Page 3

Explanation / Answer

1. (D)Electrons removed ; whenever something gets positvely or negetively chraged , that is because of removal or addition of electron only.

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