Electromagnetism

Question 1

Definition of electric field

Answer 1

A region of space where a small, positively charged particle feels a force

Question 2

Electric Field Strength

Answer 2

Force per unit charge (E = F/Q)

Question 3

Electric potential

Answer 3

E = kQ/r

Question 4

Columb’s Law

Answer 4

F = kQq/r^2

Question 5

Give the equation for the electric field strength between two plates

Answer 5

E = V/d

Question 6

Draw a radial field

Answer 6

Question 7

Give the equation for electric field strength in a radial field

Answer 7

E = kQ/r^2

Question 8

Draw a uniform field

Answer 8

Question 9

Describe equipotentials

Answer 9

Lines along which if a charge is moved no work is done.

For a uniform field, they are perpendicular to field lines

For a radial field they are concentric circles

Question 10

Define capacitance

Answer 10

Charge stored per unit potential difference

Question 11

Give the equation for capacitance

Answer 11

C = Q/V

Question 12

Give the equation and units for magnetic flux

Answer 12

Flux = magnetic flux density * cross sectional area

Webers (Wb)

Question 13

What’s the equation for a charged particle moving perpendicular to a magnetic field

Answer 13

F = BQv

Question 14

What’s the equation for a wire moving perpendicular to a magnetic field

Answer 14

F = BIL

Question 15

Describe Fleming’s Left-Hand Rule

Answer 15

Thumb = Force

First finger = field

Second finger = current (conventional)