# Physics Flashcards - Electrostatics and Magnetism

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1. (T/F) Unlike charges attract and like charges repel.
True.
2. What is the formula for Coulomb's Law?

F =
F = F = 3. If the distance between two charged objects is tripled, by how much does the electrostatic force change?
The electrostatic force would decrease by a factor of 9.
4. If the distance between two charged objects is halved, by how much does the electrostatic force change?
The electrostatic force would increase by a factor of 4.
5. What is the formula for an electric field at a distance (r) from a charge (q)?

E=
E = 6. In which direction will an electric field vector point around a positive charge?
The field vectors point away from a positive charge.
7. In which direction will an electric field vector point around a negative charge?
The field vectors point toward a negative charge.
8. What is the formula for the force that a charge (q) experiences in an electric field (E)?

F=
F =qE
9. What are the units of an electric field?
The units of an electric field are (Newtons/Coulomb) or (Volts/meter). 10. What are the units of voltage?
The units of voltage are Volts or (Joules/Coulomb). 11. What is the formula for electric potential given a charge (q) at a distance of (r)?

V=
V = 12. What is the potential difference between two points on an equipotential line?
The potential difference is zero.
13. What is the formula for electrical potential energy?

U=
U = qV
14. What happens to a dipole if it is placed in a uniform electric field?
The dipole will align with the electric field lines.
15. How much work is done on a charge if it is moved in a straight path between two equipotential points?
No net work is done.
16. What are the units of a magnetic field?
The units of a magnetic field are the Tesla. Sometimes the units are given in Gauss.

1 Tesla = 104 Gauss
17. What is the formula for the force on a moving charged particle in a magnetic field?

F =
F = (charge)(velocity)(magnetic field)(sinθ) = qvBsinθ
18. What force will a stationary charged particle in a magnetic field experience?
A stationary particle will experience no force in a magnetic field.
19. What force will a moving charge experience if it travels parallel or antiparallel to a magnetic field?
No force will be experienced if the charge moves parallel or antiparallel to the magnetic field.
20. What are the units of current?
The units of current are Amperes.

1A = 1 Coulomb/sec
21. What is the formula for current?

i =
i = 22. What is the formula for the force on a current carrying wire in the presence of a magnetic field?

F =
F = (current)(length)(magnetic field)(sinθ) = iLBsinθ
23. A proton moving in a magnetic field experiences a force towards the top of the page.

An electron moving in the same direction as the proton experiences a force in which direction?
Towards the bottom of the page.
24. A proton moves towards the top of the page in a region where a magnetic field is directed into the page. What is the direction of the magnetic force?
Towards the left.
25. A long straight wire carries a current directed towards the top of the page. What is the direction of the magnetic field on the left side of the wire?
The field points out of the page.
26. What is the formula for the magnetic field created by a long straight wire?

B = 27. A magnetic field is created by a loop of wire. What is the formula for the magnetic field at the center of the loop?

B = Author: awc1990 ID: 212584 Card Set: Physics Flashcards - Electrostatics and Magnetism Updated: 2013-04-10 07:44:17 Tags: Physics Flashcards Electrostatics Folders: Description: Physics Flashcards - Electrostatics Kaplan MCAT P34-P41 Show Answers: