Electrostatics and Magnetism

Question 1

What is the SI unit for Charge

Answer 1

Columbs

Question 2

Charge of a proton and electron

Answer 2

1.60 x 10 ^ -19 C

Question 3

Cnductors

Answer 3

Allow free and uniform passage of electrons when charged

metals

Question 4

Insulators

Answer 4

Resist the movement of charge and will have localized areas of charge that do not distribute over the surface of the material

Question 5

For positive charges field lines radiate

Answer 5

Outward

Question 6

For negative charges field lines radiate

Answer 6

inward

Question 7

Electrostatic force (fe) equaition

Answer 7

Fe= (kq1q2/r^2)

Question 8

Electric field equation

Answer 8

E= Fe/q = kQ/r^2

Question 9

What direction does a negative electrostatic force point?

Answer 9

Point from one charge to the other (attractive)

Question 10

What direction does a positive electrostatic force point?

Answer 10

One charge away from the other (repulsive)

Question 11

What charge crates an electric field?

Answer 11

Source charge, not the test charge

Question 12

Electric potential Energy

Answer 12

U= (kQq)/r

Work necessary to move a test charge from infinity to a point in space in an electric field surrounding a source charge

Question 13

Electrical potential energy decreases as

Answer 13

2 like charges move apart and when two opposite charges move toward each other

Question 14

Electrical potential energy vs electrical potential

Answer 14

Electric potential energy: potential energy stored when charges are out of equilibrium (like gravitational potential energy).Electric potential energy (U) is the property of a system. - associated with charge

Electric potential is the same, but per charge, Ueq. (Useful when comparing different points.) Electric potential (V) is the property of points in space. - associated with position

An electric potential difference between two points is called voltage, V=(Ue2/q)−(Ue1/q.)

Question 15

Units of electric potential energy and electric potential?

Answer 15

electric potential energy is measured in J

electrical potential is measured in Volts (v)

Question 16

Positive test charge will move

Answer 16

spontaneously from high potential (+) to low potential (-)

Question 17

Negative test charge will move

Answer 17

spontaneously from low potential (-) to high potential (+)

Question 18

Equipotential lines

Answer 18

Set of points around a source charge or multiple source charges that have the same electric potential.

• they are always perpendicular to electric field lines
• Work sone when charge moved from one equipotential like to another but not when a change moves from one point to another on the same line.

Question 19

Electric dipole

Answer 19

Seperation of charge within a molecule that there is a permanent or temporary region of equal and opposite charges at a particular distance.

Question 20

What is the behavior of electric dipole when exposed to an external electric field?

Answer 20

Dipole will rotate within the external electric field such that its dipole moment aligns with the field.

Question 21

What are the requirements to create nonzero

1. electric field
2. magnetic field
3. magnetic force

Answer 21

1. To create an electric field you need a charge
2. To create an magnetic field, you need a charge thats moving
3. To create an magnetic force, you need an external electric field acting on the moving charge in any direction except parallel or anti parallel.

Question 22

Field lines point from

Answer 22

North Pole to south pole