+3.0 mC is distributed uniformly along the circumference of a cirele with a radi
ID: 1772363 • Letter: #
Question
+3.0 mC is distributed uniformly along the circumference of a cirele with a radius of 20 cm. How energy is required to bring a charge of 25 mC from infinity to the center of the cirdle? a. 5.4J b. 3.4J c. 4.3J d. 2.7J e. 6.8J 6. A system consisting of a positively-charged particle and an electric field oespotenial difference and kinetic energy when the charged particle mores in the direction of the field. b. loses c. loses kinetic energy when the charged particle moves in the direction of the field. d. gains electric potential energy when the charged particle moves in the direction of the field. c. gains potential difference and electric potential energy when the charged particle moves in the direction electric potential energy when the charged partide moves in the direction of the field. of the field. 7. Determine the energy stored in C, when C-10pF, C,-12 F, G-ISAF, and p:-70v. a. 6.5 m b. 5.1 m e 3.9 mJ d. 8.0 mJ e. 9.8 m 8. Determine the equivalent capacitance of the combination shown when C- 24 pF. 2C 2c a. 20 pF 16FExplanation / Answer
5) Potential at center = kq/r = 9e9*3e-3/0.20 = 1.35*10^8 V
Energy required = qV = 1.35e8*0.025
= 3.4 J answer
Option b is correct.
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