How does the “World’s Simplest Motor” work? Describe
the torque due to the magnetic field on...
How does the “World’s Simplest Motor” work? Describe
the torque due to the magnetic field on the wire loop as it turns.
Explain why it is necessary to ensure only one side of the wire is
scraped of enamel to make electrical contact.
3. Does the magnetic field due to the Earth affect your result
of the e/m ratio? Explain�
4. Compare trajectories of electrons and protons moving with the
same speed in the magnetic field produced by the Helmholtz
coils?
Carefully measure the magnetic field at the end of the solenoid.
How does it compare to the value at the center of the solenoid? Try
to prove what the value at the end should be.
Describe how a magnetic field is generated by simply moving a
magnet relative to a coil. Please be sure to use an equation to
help you explain the physics! Thank you.
in
words and a mathematical expression, describe how to determine the
magnetic field created by (i) straight current carrying wire, (ii)
current caryying circular loop, (iii) current carrying
solenoid.
Problem 1 ( answer all questions )
a. How does a dc-motor torque-speed characteristic behave when a
dc motor is applied
with a constant dc voltage under an open-loop mode of
operation?
b. What additional capability can be achieved by flux weakening in
wound-field dc
machines?
c. What are various types of field windings?