A metal sphere of radius 2.0 cm carries a charge of +3.0 mu C. What is the magni

Question

A metal sphere of radius 2.0 cm carries a charge of +3.0 mu C. What is the magnitude of the electric field 6.0 cm from the center of the sphere? 4.5 times 10^5 N/C 1.35 times 10^6 N/C 5.7 times 10^6 N/C 7.5 times 10^6 N/C 6.75 times 10^7 N/C What is the electrical potential 6.0 cm from the sphere in the problem above? 4.5 times 10^5 V 1.35 times 10^6 V 5.7 times 10^6 V 7.5 times 10^6 V 6.75 times 10^7 V Consider two points in space, A and B. What is the potential difference between point A and point B if 10 J of work is required to move a charge of 4.0 C from one point to the other? 0.4 V 2.5 V 14 V 40 V For a proton moving in the direction of an electric field its potential energy increases and its electric potential decreases. its potential energy decreases and its electric potential increases. its potential energy increases and its electric potential increases. its potential energy decreases and its electric potential decreases. both its potential energy and it electric potential remain constant. Two protons are released from rest, with only the electrostatic force acting. Which of the following statements must be true about them as they move apart? (There could be more than one correct choice.) Their electric potential energy keeps increasing. Their kinetic energy keeps increasing. Their electric potential energy keeps decreasing. Their kinetic energy keeps decreasing. Their acceleration keeps decreasing.

Explanation / Answer

7.

E=kq/r2=4.5*105 V/m

r=6 cm

k=9*109 Nm2/C2

Answer A.

8.

V=kq/r=7.5*106 V.

Answer D.

9.

W=qU=2.5 V.

Answer B.

10.

Answer A.

11. Answers C, E.

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