motor armature had a resistance of 0.015 ohms. Assuming the 1.5V battery
could drive a constant current through this coil at rest, what would
the current be?
would the electric power driven through the (stationary) coil be in
would this energy go?
actual measured current flow through the coil is about 5 A. What
magnetic field does this produce in an ideal coil? Draw the
direction of this field in a diagram showing the coil.
is the permanent magnet stuck to the D cell needed in our motor?
and describe the magnetic fields in this motor, including how they
the motor in the dark. What do you see at the paper clip/armature
engineer could claim that this motor should simply lock itself into
a single position, and the motor does have a tendency to do so.
What is this (electrically powered) position? Why does it not continuously
lock in this position?
second magnet can be brought beneath the coil and can either slow
or accelerate the armature's rotation (see below). Explain why,
using a diagram.