Transcript Jeopardy Review (PowerPoint)

Welcome to Physics Jeopardy
Magnetic
fields
Right Hand
Rules
Motor
Electro magnetic
Induction
Transformers
100
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200
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300
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400
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500
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500
Final Jeopardy Question
Magnetic Fields
100 pts
If two magnets are attracted to one anther
their poles must be?
Back
Magnetic field
100 pts
Answer
Opposite
Back
Magnetic field
200 pts
Can a magnet ever have a single pole?
Why or why not?
Back
Magnetic field
200 pts
No, Poles are regions of strong magnetism on each
end of the magnet, the magnetic field lines are
continuous
Back
Magnetic field
300 pts
What kind of material is a lodestone
made of?
Back
Magnetic Field
300 pts
Ferromagnetic
Back
Magnetic Field
400pts
What causes a nail to become a temporary
magnet?
Back
Magnetic Field
400 pts
Answer
The domains of the nail align themselves with a
permanent magnet.
Back
Magnetic Field
500 pts
What does a magnetic domain refer
to?
Back
Magnetic Field
500pts
Answer
Small magnetic regions caused from
electron spin
Back
Right hand rule
100pts
X
Determine the magnetic field of the wire
with a current going into the page.
Back
Right Hand Rule
100 pts
Clockwise
Back
Right hand Rule
200 pts
A current flows west to east in a wire.
Determine the direction a compass will point
above the wire.
Back
Right Hand Rule
200pts
Answer
South
Back
Right Hand Rule
300 pts
+
What is the direction of the magnetic field
Of the above electromagnet?
Back
Right Hand Rule
300 pts
S
S
S
Back
N
N
Right Hand Rule
400
The direction that the force has on a current
carrying wire is ___ the external magnetic field
Back
Right Hand Rule
400 pts
Answer
Perpendicular
Back
Right Hand Rule
500 pts
12.The force exerted on a current carrying
wire depends on ___ &___& ___
Back
Right and Rule
500 pts
Answer
F= BIL
Magnetic field, Current, Length of wire
Back
Motor
100 pts
The speed of a motor can be increased
by increasing the _____?
Back
Motor
100 pts
Answer
Current
Back
Motor
200pts
What is the principle behind the electric motor?
Back
Motor
200pts
Answer
A current carrying conductor placed
perpendicular to a magnetic field will
experience a force
Back
Motor
300pts
What are the essential parts to a motor?
Back
Motor
300pts
Answer
Armature, Split rings, magnetic field, brushes
Back
A motor that rotates clockwise has
a magnetic field going from left to right
What are the poles on the red and blue
bobbins as they rotate?
Back
Red and Blue top – North
Red and Blue bottom - South
Back
Why must the coils be wound in
opposite directions around the armature?
Back
The polarity of the two
electromagnets must be
opposite.
Back
Electromagnetic
Induction
100pts
What is the force on a 120 cm long wire
perpendicular to a external magnetic field of
.500 T with a current of 4.00 amps moving
through the wire?
Back
2.4 N
Back
Electromagnetic
Induction
200pts
How can a electric current be generated in a
wire without a battery?
Back
Moved perpendicular
across a magnetic field
Back
Electromagnetic
Induction
300pts
What does EMF depend on?
Back
B
v
l
Magnetic field
Velocity
Length of wire
Back
Electromagnetic
Induction
400pts
The Max Emf will be induced in a wire moving
in a magnetic field when the wire moves
Back
Perpendicular
to the
magnetic field
lines
Back
Electromagnetic
Induction
500pts
What is the EMF for a .6m long wire is
moved at right angles to the lines of force of
a magnetic field whose strength is 0.3T at a
speed of 2.0m/s The induced EMF in the
wire is
Back
.36 V
Back
What is the
difference between
generators and
motors?
Back
Motor converts electricity to mechanical energy
Generators converts mechanical energy to electrical
energy
Back
What parts of a DC generator
convert the AC in the armature to
the DC in the external circuit?
Back
The split rings and brushes
Back
A device consisting of a
coil that is mechanically
rotated in a stationary
magnetic field is called?
Back
Generator
Back
In a transformer the primary coil is
connected to the _________ and the
secondary coil is connected to the
__________
Back
Primary ->Power supply
Secondary -> load
Back
A step up transformer has a primary coil of 800turns
and is connected to a 120 V source. How many turns
Would be needed in the secondary coil to supply 60 V.
Back
400 Coils
Back
When was the
internet developed?
Back
1960’s
Back