Eletromagnetism Notes 1-2

Question 1

Symbol for charge

Answer 1

q

Question 2

Units for charge

Answer 2

Coulombs

Question 3

Coulomb´s Law describes

Answer 3

the electric force between two charges

Question 4

Er stands for

Answer 4

relative permittivity or dielectric constant

Question 5

Eo stands for

Answer 5

permittivity of free space

Question 6

Expression for electric field strenght

Answer 6

E1 = Ft1/qt

Question 7

If E does not change with respect to time, E is said to be

Answer 7

eletrostatic

Question 8

The lines of the electric field point away from a

Answer 8

positive charge

Question 9

The lines of the electric field point towards a

Answer 9

negative charge

Question 10

The electric flux has the following equation

Answer 10

Flux = E.dA (vectors)

Question 11

Gauss’s Law for electric field

Answer 11

integral of E.dA = charge/ permittivity

Question 12

True or False: The Flux depends on the radius

Answer 12

False

Question 13

True or False: Gauss’s Law gives the electric field at the surface due to the enclosed charge

Answer 13

True

Question 14

The electric force of a particle of charge q is equal to

Answer 14

F = q E (electric field in which the charge q was placed)

Question 15

The total work done by the exterior is equal to dWext =

Answer 15

dWext = Fext.dl = -Fel.dl

Question 16

If we do work the potential energy of the system …

Answer 16

… increases

Question 17

If work is done against us, the potential energy …

Answer 17

… decreases

Question 18

The potential difference Va - Vb is equal to

Answer 18

Va - Vb = Wext / q

Question 19

An electrostatic field is a

Answer 19

conservative field

Question 20

The electric potential energy is equal to

Answer 20

Ua - Ub = q1 (Va - Vb )

Question 21

The lines that link all the points that have the same potential are called

Answer 21

equipotentials lines