4C: Electrostatics and Ciruits

Question 1

What is the relation between magnetic field strength to current and radius?

Answer 1

• directly proportional to current

- inversely proportional to radius

Question 2

When resistors are in series (current/voltage) is same and when resistors are in parallel (current/voltage) is same.

Answer 2

series-current

resistors-voltage

Question 3

Capacitance equation

Answer 3

C= eA/d
Q=CV
Capacitor energy charge= 1/2 CV^2

Question 4

Which information is needed for determining resistance?

Answer 4

resistivity, length of wire, cross-sectional area

Question 5

When does destructive interference occur?

Answer 5

maxima of two waves are 180 degrees out of phase

Question 6

magnetic force moves in what direction compared to velocity of charge and direction of magnetic field?

Answer 6

perpendicular

Question 7

Current travels in what direction compared to electrons?

Answer 7

opposite direction: current travels from + to - and electron travels from - to + side

Question 8

In which direction do electrons and current travel in relation to anode and cathode?

Answer 8

electrons: anode to cathode
current: cathode to anode

Question 9

galvanic cell convert what type of energy?

Answer 9

chemical to electrical energy