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Review for Ampere+ Faraday Exam
Ampere (Repeat from last test)
 Use Ampere’s Law to find the magnetic
field outside a current carrying wire
(GRAPH)

Use Ampere’s Law to find the magnetic
field inside a uniform current density
carrying wire (GRAPH)
Lenz’s and Faraday’s Law
Notes : < Induction and Inductance >
 What did Faraday’s Experiment show?
<4>
 What are three ways to change magnetic
flux? <6a>
 Be able to use Faraday’s law and Lenz’s
law to recognize situations in which
changing flux through a loop will cause
an induced emf or current in the loop. (is
it a complete loop? Is the flux changing
with time? Resistance?) <5,13,14-16>
 Be able to derive the equation for a loop
entering or leaving a magnetic
field<8,10,2012 Electricity and
Magnetism Question 3>




Use Ampere’s Law to find the magnetic
field inside and outside a coaxial cable
Use Ampere’s Law to find the magnetic
field inside and outside a hollow wire
Use power rule to find the current for a a
nonuniform current density carrying wire
limits 0 to r inside wire
0 to R Outside wire
 Use Ampere’s Law to find the magnetic
field Inside a solenoid

Find the force on a current carrying wire
due to other wires or force per length
(plus direction )
opposites directions repel!
Be able to apply Lenz’s Law to determine
the direction of the current
Remember to use your four steps: direction of
B, how B is changing with time, induced B
direction and then grab the wire
o For a loop entering or leaving a
magnetic field <8-10>
o For a increasing or decreasing
magnetic field <11>
o For a bar moving in a magnetic
field <11>
o For a changing area <11>
o For a magnet moving towards or
away from the loops of wire <1112>
o For opening or closing a switch
<14>
o For a loop moving towards a
current carrying wire<17-18>
 Be able to find the rate at which you do
work to push a loop into a magnetic field
or the rate at which the thermal energy
appears in a loop. <8g, 8h,>
 Write Newton’s 2nd Law for a bar on an
incline or falling down in a magnetic field
usually solving for velocity <2012 AP
Question 3>(34)
 Be able to find magnetic flux<6a,7>

o Using a constant magnetic field
with respect to area <2012 AP
Question 3>
o Using a changing magnetic field
with area (integration), yes you
need to know how to find the
magnetic field due to a long
straight wire<18,19>
o Using a changing area within a
constant magnetic field<8>
o Remember to integrate with
respect to area NOT time!!!!!!
Recognize what quantities the magnitude
of the induced emf and induced current
depend on<10>


Use Faraday’s Law to calculate
current induced or voltage
o For a loop entering or
leaving a magnetic field
<8-10>
o For a bar moving in a
magnetic field <11>
o For a loop moving towards
a current carrying
wire<17-18>
o Changing magnetic field
equation given
<19,20,21,25>
o Changing current with
given equation <22>
o Changing emf with given
equation <23>
o Changing area with given
equation <24>
Calculate the induced Electric
field
o Inside the magnetic field
<26>
o Outside the magnetic
field<27>
Inductors
 Know what inductance depends on and
how to calculate it for a solenoid <30,40>
 Be able to solve for current as a function
of time for both “charging” and
“discharging”<32>
 Know the graphs for current and voltage
for both “charging” and
“discharging”<32-34,39,42>
 Know how a inductor acts and that it
maintains current <32,33,37,39,42>
 Be able to calculate the energy stored in
and inductor <35,38,40>