Exam 2 Review
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1
what is the definition of electron current (i)?
number of electrons per second that enter a section of a conductor
2
the magnetic field is _____ to the direction of the current
perpendicular
3
a compass needle points in the direction of the ____ magnetic field
net
4
electron current moves theough the _____ end of a battery through a circuit to the _____ end of the battery
negative, positive
5
what is the current node rule?
in steady state, the electron current entering a node is equal to the current leaving the node
6
what is the loop rule (energy conservation)?
sum of change in electric potential in a closed loop = 0
7
describe the difference between ohmic resistor and non-ohmic resistor
ohmic resistors have a constant resistance independent of current, whereas non-ohmic resistors do not
8
if the charge is not moving, ______ fields have no effect on it, whereas _____ fields affect charges even at rest
magnetic, electric
9
magnetic forces between two wires carrying current, likes ____, unlikes ____, which is opposite of electric forces
attract, repel
10
change in potential difference is path _____
independent
11
a moving charged particle creates a _______ field
magnetic
12
what is the equation for the biot-sivart law?
B = mew knot/4pi*qvxr^2
13
magnetic dipole moment points in the ____ direction as the magnetic field
same
14
what does electron mobility depend on?
type of metal and its temp
15
what makes current flow in a circuit?
nonzero electric field inside the wire keeps electrons flowing
16
a gradient of rings produce a ______ _______ field
uniform electric
17
what stays the same when elements are connected in series?
current
18
what is the total resistance in a series?
sum of all resistors
19
what stays the same when elements are connected in parallel?
voltage
20
what is the total resistance in parallel?
1tot = 11 +12...
21
what is the equation for magnetic force?
fmag=qvxB
22
how do you derive the radius of a moving particle?
fmag = mv^2 = fnetperp
23
what is the potential difference between two points in a metal in equilibrium?
zero
24
how do you calculate charge carrier density (n)?
num of conducting electrons/volume
25
delta V hall =
vBh (use to solve for n)
26
what is the difference between equilibrium and steady state?
in equilibrium, v = 0 and no charge is moving, in steady state v doesn't equal 0 and charges are moving but not accelerating
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