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A Charge Q = -820 NC Is Uniformly Distributed on a Ring

Question 29

Multiple Choice

A charge Q = -820 nC is uniformly distributed on a ring of 2.4 m radius. A point charge q = +530 nC is fixed at the center of the ring. Points A and B are located on the axis of the ring, as shown in the figure. What is the minimum work that an external force must do to transport an electron from B to A?
(e = 1.60 × 10-19 C, k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2) A charge Q = -820 nC is uniformly distributed on a ring of 2.4 m radius. A point charge q = +530 nC is fixed at the center of the ring. Points A and B are located on the axis of the ring, as shown in the figure. What is the minimum work that an external force must do to transport an electron from B to A? (e = 1.60 × 10<sup>-19</sup> C, k = 1/4πε<sub>0</sub> = 8.99 × 10<sup>9</sup> N ∙ m<sup>2</sup>/C<sup>2</sup>) A) -8.7 × 10<sup>-17</sup> J B) +7.2 × 10<sup>-18</sup> J C) +1.0 × 10<sup>-16</sup> J D) +8.7 × 10<sup>-17</sup> J E) -7.2 × 10<sup>-18</sup> J


A) -8.7 × 10-17 J
B) +7.2 × 10-18 J
C) +1.0 × 10-16 J
D) +8.7 × 10-17 J
E) -7.2 × 10-18 J

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