SHM, Waves, Thermo, E&M Practice Problem Workbook
SHM, Waves, Thermo, E&M Practice Problem Workbook
SHM, Waves, Thermo, E&M Practice Problem Workbook
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MECHANICS PRACTICE PROBLEM SETS 35<br />
Unit 10<br />
CHARGE, FIELDS, CURRENT POTENTIAL AND DC CIRCUITS<br />
10.1 COULOMB’S LAW<br />
1. What is the magnitude of the force of a 10.0-µC charge on a 3.0-µC charge 2.0 m<br />
away<br />
Answer: 0.068 N<br />
2. How far apart must two electrons be if the force between them is 2.0 x 10 -12 N<br />
Answer: 1.1 x 10 -8 m<br />
3. A +2.2 X 10 -9 C charge is on the x-axis at x= -1.5 m and a +5.4 x 10 -9 C charge is<br />
on the x-axis at x= 2.0 m. Find the net force exerted on a +3.5 x 10 -9 C located at<br />
the origin<br />
Answer: 1.2 x 10 -8 N<br />
to the left<br />
4. Three charges are shown 13. in the Three figure charges below. are shown Find the in the magnitude figure below. and Find direction the magnitude of an dire<br />
the electrostatic force at the the 5-nC electrostatic charge. force of the 5 nC charge. Answer: 1.4 x 10 -5 N<br />
at 257.5°<br />
5. A fly accumulates 3.0 x 10 -10 C of positive charge as it flies through the air. It<br />
settles on a leave. What is the magnitude and direction of the electric field at a<br />
location 2.0 cm away from the fly<br />
Answer: 6750 N/C<br />
6. When a TV set is turned on to watch cartoons, an electron beam in the TV tube is<br />
steered across the screen by an electric field between two charged plates. If an<br />
electron experiences a force of 3.0 x 10 -6 N, how large is the field between the<br />
deflection plates Answer: 1.9 x 10 13 N/C<br />
7. A tiny ball with a mass of 0.012 kg carries a charge of -18-µC. What is the<br />
magnitude and direction of the electric field needed to cause the ball to float<br />
above the ground Answer: 6533 N/C downward<br />
14. Three charges are shown below. Find the magnitude and direction of the<br />
electrostatic force on the 6 nC charge.<br />
8. A charged particle of +12 nC is located 0.10 m to the left of another charged<br />
particle of -12 nC. What is the net electric field at a point that is located between<br />
the two charges at a distance of 6.0 cm to the right of the positive charge<br />
Answer: 9.8 x 10 4 N/C to the right<br />
a. What is the net electric field at a point that is located 4.0 cm to the left of<br />
the positive charge Answer: 6.2 x 10 4 N/C to the left<br />
9. What is the electric potential 0.50 m away from a 4.5 x 10 -4 C point charge<br />
Gamzon & Gregorian-Michaelsen 6/13/12
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