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A Charge of +3 ±\pm C Is Distributed Uniformly Along the Circumference of a Circle

Question 105

Multiple Choice

A charge of +3.0 ±\pm C is distributed uniformly along the circumference of a circle with a radius of 20 cm.How much external energy is required to bring a charge of 25 ±\pm C from infinity to the center of the circle?


A) 5.4 J
B) 3.4 J
C) 4.3 J
D) 2.7 J
E) 6.8 J

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