D.2 Electric and Magnetic Fields

Question 1

Where does the charge go when an object becomes charged

Answer 1

Its distributed around the outer surface of the object

Question 2

Coulomb (C)

Answer 2

Units of charge

Question 3

Law of conservation

Answer 3

Charge cannot be created or destroyed

Question 4

Coulombs law

Answer 4

The force between two point charges is proportional to the product of their charges and inversely proportional to the square of their separation.

Question 5

k

Answer 5

The coulomb constant

Question 6

3_0

Answer 6

Permittivity of free space

Question 7

Ways objects can become eletrically charged

Answer 7

Friction, contact, electrostatic induction

Question 8

Friction

Answer 8

Electrons are transferred between the objects. They gain equal but opposite charges. Only works on insulators

Question 9

Contact

Answer 9

Gain the same charge as the charged object. Original charged object becomes less charged but not neutral. Only works on conductors.

Question 10

Electrostatic Induction

Answer 10

The object must be grounded during the charging process. Gains the opposite charge to the charged rod bought close to it.

Question 11

Why is the earth considered a conductor.

Answer 11

Because of its size it is considered to be an infinite store of charge. Electrons will flow to/from the earth from a charged object to discharge it.

Question 12

Electric Field

Answer 12

A region of space where a charged object experiences a force due to its charge.

Question 13

Electric Field Strength

Answer 13

The force per unit charge experienced by a small positive test charge placed in the field.

Question 14

Uniform Electric Field

Answer 14

Created between two oppositely charged plates. The e.f.s is the same strength anywhere between the plates.

Question 15

Formula for calculating EFS of a uniform field

Answer 15

E= V/d

Question 16

Formula for calculating EFS when given a charge that is placed in a field.

Answer 16

E=F/q

Question 17

Calculating field strength at a specific distance from the charge that is creating the field.

Answer 17

E=kq1/r^2

Question 18

Milikans Experiment

Answer 18

Determined the charge of an electron.