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