Electromagnetism: Essentials

Question 1

Electric field of a point charge

Answer 1

Question 2

Electric dipole orientation

Answer 2

Dipole moment points from negative to positive (in opposite direction of field lines)

Question 3

Torque and potential for an electric dipole

Answer 3

Question 4

Gauss’s Law (differential and integral forms)

Answer 4

*in linear dielectric media, use permittivity of medium, not of free space

Question 5

Electric Flux

Answer 5

Question 6

Electric field and potential in a conductor (with infinitely mobile charge)

Answer 6

The electric field is zero, while the electric potential is constant.

Question 7

Where does exess charge lie in a conductor?

Answer 7

On the surface

Question 8

Point charge electric potential relative to V = 0 at infinity

Answer 8

Question 9

Definition of potential difference

Answer 9

Question 10

Electric potential of an extended body relative to V = 0 at infinity

Answer 10

Question 11

Definition of capacitance and differential relationship

Answer 11

Question 12

Parallel Plate Capacitance

Answer 12

Question 13

Electrical Energy Density (in vacuum and in medium)

Answer 13

Question 14

Definition of current

Answer 14

Question 15

Current density

Answer 15

Current per area

Question 16

Gauss’s Law for Magnetism

Answer 16

Question 17

Magnetic dipole moment defintion

Answer 17

Current times area

Question 18

Magnetic dipole torque and potential

Answer 18

Question 19

Biot-Savart Law

Answer 19

Question 20

Maxwell-Ampere Law

Answer 20

Question 21

Three types of magnetism

Answer 21

Paramagnetism: lines up with the applied field

Diamagnetism: opposes the applied field

Ferromagnetism: permanent with various domains

Question 22

Lenz’s Law

Answer 22

Current creates field to oppose change in flux

Question 23

Differential magnetic force

Answer 23