Exam #1

Question 1

What does Static means?

Answer 1

time invariant

Question 2

What is a Vacuum?

Answer 2

Free Space

Question 3

The Electrostatic field is produced by

Answer 3

static charge distribution

Question 4

Coulumbs Law states that the force between two charge is

Answer 4

1. among the line joining them
2. Directly proportional to the product q1q2
3. Inversely proportional to the square of the distance R between them

Question 5

The Force between two charges is measured in

Answer 5

Coulumbs [C]

Question 6

F21 is the force on…

Answer 6

Q2 due to q1

Question 7

Couloumbs Law is -mathematically -

Answer 7

F=k(q1q2)/r^2

Question 8

Suporposition apply to

Answer 8

Electrostatic force, electric field and electric potential for a charge

Question 9

electric field intensity is denominated by

Answer 9

E and it is a vector

Question 10

E goes in the direction of

Answer 10

Electrostatic force F

Question 11

Electrostatic field mathematical

Answer 11

F/Q=E (vector)

Question 12

E at a point r due to a charge at r’

Answer 12

E=kQ(r-r’)/|(r-r’)|^3

Question 13

line charge density units

Answer 13

C/m

Question 14

surface charge density units

Answer 14

C/m^2

Question 15

volume charge density units

Answer 15

C/m^3

Question 16

For a line charge (finite), E is

Answer 16

(line charge density)/2πE0rho

Question 17

The electric flux density is D

Answer 17

D=E0E (E0 is the dielectric at free space)

Question 18

The volume density charge is

Answer 18

equal to the divergence of D

Question 19

Continuos charge distribution symmetry depends

Answer 19

(rectangular) if only depends on x or y or z at once
(cylindrical) if only depends on rho
(spherical) if only depends on r

Question 20

When the surface is not symmetric

Answer 20

E nor D can be determined