AP Physics 2: 2.2 Systems Interactions and Changes
Recommendation
Want a study guide too?
AP Physics 2: 2.2 Systems Interactions and Changes. What emf is introduced in the coil?
AP | AP Physics 2 |
AP Physics 2 | Systems Interactions and Changes |
Language | English Language |
Science Practice 4 | Using data collection strategies |
Test Prep | AP Physics 2 |
Transcript
she's playing in front of a huge crowd She powers
through a sweet riff and the crowd goes wild Carrie
starts showboating swinging or guitar around around it flies off
the strap and smashes into the wall Talked about a
reality check She sorts through the pieces and notices that
the guitar pick up is a square coil of wire
Well maybe the broken guitar could be a science project
after all Science fair's coming up right Carrie flips open
her tax book looks for the words coil and finds
a page describing faraday's law According to this e m
f is induced in a coil within turns by a
change in magnetic floods In time carrie counts two hundred
turns in the coil and measures this side's as one
centimeter she places the coil in a uniform magnetic field
that points into the plane of the page Take a
look at this diagram right there Carrie increases be from
point Oh won t two point oh sixty in delta
t equals one s what imf is induced in the
coil and hear the potential answers one ten hundred thousand
when life hands you lemons while you make lemonade and
when life hands you a smashed guitar you make a
science project yeah we're pretty punk rock not so punk
rock that we have our own magnetic field generator though
kerry has quite the setup here right let's look at
magnetic flux First of all magnetic flux means the amount
of magnetic field passing through an area waken Think of
it like the density of a magnetic field in this
certain space so we can swap out b a for
the flocks which means our equation now shows the imf
equals the number of coils times the change in b
a over the change in time And since the area
is not changing we can bring that out Hang with
him Carrie increases the byfield from point Oh won t
two point oh sixty So the change in b equals
point Oh five tesla's Now we can plug in our
numbers and get back to rock in the house Mm
equals two hundred coils times one centimeter squared times point
oh five tesla's over one second Don't forget that with
an area of one centimeter squared it comes toh one
times ten to the negative forthe meters squared after we
do the math we find that the magnitude of imf
created is one mil eval So the correct answer is
a oh and one last thing way used a version
of faraday's law that cheats just a little bit faraday's
law expressed in this equation really should have a negative
sign in front of it negative sinus part of lens
law and it works to show the direction the current
needs to move in order to create a magnetic field
that opposes the change in floods But because this question
is really just dealing with the magnitude of voltage we
don't need to worry about the direction so don't tell
anyone but yeah we just broke the law one thrill
and remember to be careful with musical instruments They're meant
to make beautiful music that we don't want to be
smash guitars or broken drums that's or even a dented 00:03:18.22 --> [endTime] kazoo that matter