Transcript Back

Welcome!
The Topic For Today Is Magnetism and
Electromagnetic Induction
Your Topic
Magnets
The Nature of
Magnetic
Fields
Devices
Right Hand Rule
Calculations
200
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400
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600
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1000
Bonus Question: Wager up to your teams total points
Topic 1: 200
• Question:
• Finish this sentence: Two north poles will
_________, but a north and south pole
will_______.
• Answer
• Repel, attract
Topic 1: 400
• Question:
• If you allow a magnetized paperclip to float in
water undisturbed, it will _____________
• Answer
• Align to the earth’s north and south pole.
Topic 1: 600
• Question:
• If I break a bar magnet in half, what will
happen to the two pieces?
• Answer
Two new magnets will be formed
Topic 1: 800
• Question:
• Regions on a bar magnet that produce
magnetic forces are called magnetic
• Answer
poles
Topic 1: 1000
• Question:
• What are two ways that magnets are like
electric charges?
• Answer
They can both attract and repel without touching &
The strength of their interaction depends on the
distance of separation.
Topic 2: 200
• Question:
• Which end is north and which is south?
• Answer
right is north, left is south
Topic 2: 400
• Question:
• Magnetic fields are produced by
• Answer
Moving charged particles or magnetic
domains
Topic 2: 600
• Question:
• The earth’s magnetic field is most likely due to
• Answer
convection currents in the earths molten
core
Topic 2: 800
• Question:
• Explain what you can tell from this picture with
regard to the compasses and wire. .
• Answer
Option b has current
Topic 2: 1000
• Question:
• Describe the two types of electron motion
that produce the magnetic field in a bar
magnet.
• Answer
electrons in constant motion about atomic
nuclei & electrons spinning about their own
axes like tops
Topic 3: 200
• Question:
• A device consisting of a coil that is
mechanically rotated in a stationary magnetic
field is called
• Answer
• generator
Topic 3: 400
• Question:
• A device that transforms electrical energy to
mechanical energy is a
• Answer
• motor
Topic 3: 600
• Question:
• A device that uses two coils around an iron
core to change the voltage across a circuit is
called a
• Answer
• transformer
Topic 3: 800
• Question:
• What does a step-up transformer do?
• Answer
• Increases the voltage
Topic 3: 1000
• Question:
• The primary coil of a transformer has 1000
turns on it and the secondary coil has 2000
turns on it. What type of transformer is this?
• Answer
• Step up
Topic 4: 200
• Question:
• A wire with flowing electricity is coming up
from the floor to the ceiling. Describe the
magnetic field around the wire.
• Answer
Topic 4: 400
• Question:
• Electrons are toward the white board,
describe the magnetic field.
• Answer
Topic 4: 600
• Question:
• Find the direction of the force.
• Answer
• Out of the page
Topic 4: 800
• Question:
• Describe the magnetic field around the
current.
• Answer
• Out of page above, into below
Topic 4: 1000
• Question:
• What is the direction of current?
• Answer
• down
Topic 5: 200
• Question:
• 0.10 m of wire is placed between the poles of a
large magnet. The magnet has a field strength of
2.0 T. The current in the wire is 4.0 A. What is the
magnitude of force on the wire?
• Answer
0.8 N
Topic 5: 400
• Question:
• A transformer has 12,000 v input to the
primary coil. The primary coil has 2400 turns
of wire while the secondary has just 500 turns
of wire. What is the voltage output of the
secondary coil?
• Answer
• 2500
Topic 5: 600
• Question:
• How many turns of wire will a transformer
need in its secondary coil if the primary coil
has 50 turns and voltage is stepped up from
10 v to 1000 v?
• Answer
• 5000
Topic 5: 800
• Question:
• A transformer has 1200 v input to the primary
coil. The primary coil has 240 turns of wire
while the secondary has just 50 turns of wire.
What is the voltage output of the secondary
coil? And what type of transformer is it?
• Answer
250 and a step down
Topic 5: 1000
• Question:
• A 50.0 cm long wire carries a 15.0 A current
which flows from right to left. When the
magnetic field strength is 0.2 Tesla, what is the
magnitude of the magnetic force acting on the
wire?
• Answer
• 1.5 N
Bonus Question:
up to your total
• Question:
• A 60.0 cm long wire carries a 10.0 A current
which flows from right to left. When the
magnetic field strength is 0.2 Tesla, what is the
magnitude of the magnetic force acting on the
wire?
• Answer
• 1.2 N
Daily Double
The Winner Of The Last Round
Write Down How Much Money
You Are Willing To Risk
If You get the Question write you win that money
If you get it wrong you Loss the money!
Daily Double
The Winner Of The Last Round
Write Down How Much Money
You Are Willing To Risk
If You get the Question write you win that money
If you get it wrong you Loss the money!