Electrostatics, electromagnetism

Question 1

Coulomb’s law

Answer 1

magnitude of electrical force that each charge exerts on the other
• F=k q1q2/r^2
• Electron= 1.6 x 10^ -19C

Question 2

Electric field

Answer 2

• Electric field is a region of space where a charged particle would feel an electrostatic force if it were moved there
E=F/q’
Electrical force F acting on test charge q’

Question 3

Equipotential line

Answer 3

connects all points within an electric field sharing the same potential
• EF does no work on test charge moved along an equipotential line
When test charges move in direction of a field line, they move from higher to lower potential

Question 4

Dielectric constant, K

Answer 4

ratio of the electrical force between two charges when they are in a vacuum vs in a medium
• Fmedium= Fvacuum/K
• Strong polar medium responds to external EF by reorienting its polar molecules, so net electric field becomes weaker

Question 5

Lenz’s Law

Answer 5

applies to conducting loop. Charges flow completely around loop, inducing current in loop.
• “When a conducting loop experiences a change in the magnetic flux within its boundaries, a current will be induced in the loop that creates a magnetic flux opposing the change in the external magnetic flux”

Question 6

Faraday’s Law

Answer 6

as you increase rate at which loop enters a B field, magnitude of the induced current increases

Question 7

Mass Spec

Answer 7

once a charged particle enters a mag field, it will move in a circular path at a constant speed. Radius of path depends on mass of particle and other things. Heaier particles traverse bigger circles, greater radiuses
• r=mv/qB