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Physics Magnetism Question and answers rated A+

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Physics Magnetism Question and answers rated A+ Physics Magnetism What causes magnetism? - correct answer Magnetism is caused by moving charges. Under what conditions will a charge in a magnetic field NOT experience a force? - correct answer A charge will not experience a force in a ma...

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  • October 19, 2024
  • 11
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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Physics Magnetism
What causes magnetism? - correct answer ✔Magnetism is caused by
moving charges.


Under what conditions will a charge in a magnetic field NOT experience a
force? - correct answer ✔A charge will not experience a force in a magnetic
field if it is not moving or if it is moving parallel to the magnetic field.


Which way do the field lines of a magnet point? - correct answer ✔The field
lines point the way a compass points: towards a south magnetic pole.


What is a solenoid and what is the magnetic field in/around one like? - correct
answer ✔A solenoid is a wire coiled like a slinky. The field inside is like a bar
magnet.


What do the field lines around a bar magnet look like? A horseshoe magnet?
A disk magnet? A ring magnet? - correct answer ✔Field lines around a bar
magnet form semicircles from north to south pole. A ring magnet must be
placed on end since the poles are on the flat sides; then its field looks much
like a tiny bar magnet.


What does the magnetic field around a current-carrying wire look like? -
correct answer ✔A current carrying wire creates a B field which is in the
shape of concentric circles.


When can you cause a current to flow through a coil of wire? - correct answer
✔If you force a coil to move through a magnetic field or change the magnetic
field a coil is in, current will flow through the coil.

, How can you create an electromagnet? - correct answer ✔Coil a wire and
connect it to a battery and you have an electromagnet. It can be strengthened
by an iron bar through its center.


What are domains and how are they connected to a magnet's strength? -
correct answer ✔Domains are regions where atomic magnets point the same
way in a material. The more that point the same way, the stronger a magnet
the material will be.


Why aren't all materials magnetic? - correct answer ✔Most atoms have
electrons placed symmetrically so their magnetic fields cancel out.


How does a doorbell work? - correct answer ✔Explanation of Doorbell:
Pushing the button completed the circuit, making current flow through the
electromagnet and therefore giving it strength. The magnet pulls the spring
and clapper device towards it and rings the bell. But this breaks the circuit
(since the spring is no longer touching the contact screw). That makes the
electromagnet lose strength, so the spring snaps back to the left and
completes the circuit once more. It repeats.


How does a circuit breaker work? - correct answer ✔Explanation of Circuit
Breaker: The electromagnet in the circuit breaker is only strong enough to pull
the T bar and break the circuit if the current passing through it is larger than
the circuit breaker setting. The T-bar is part of the circuit, so when the magnet
pulls the bar, the circuit breaks and the magnet no longer has strength enough
to hold the T-bar. A spring pulls the T-bar back into position, completing the
circuit once more. If the current is still too large, this gives the electromagnet
enough strength to pull the T-bar away from the circuit again.


What happens to two current-carrying wires which are anti-parallel to one
another? - correct answer ✔Anti-parallel current carrying wires will repel.

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