Solve part B only please, part A is just posted in to help give some context for
ID: 2112790 • Letter: S
Question
Solve part B only please, part A is just posted in to help give some context for part B.
A. Obtain a commercially made coil of wire. (It should have a base unit with two terminals.) As you
have seen, a single loop of wire acts as a small magnet when current flows through it. Winding a coil
with many loops of wire is a way to produce a stronger magnetic field. The commercial coil can
function as a magnet when a battery is used to drive current through it.
Use a compass, battery, connecting wires, and the coil itself to test how the coil wound. In other
words, if electric current comes into one of the terminals, figure out whether it travels clockwise or
counterclockwise as it moves through the windings to reach the other terminal. Draw a sketch of
your arrangement below, and explain the test that you made.
B. Obtain a microammeter. This is a device to measure current. When current enters the positive
terminal of the microammeter and exits the negative terminal, the needle will deflect to the right.
Connect the coil and the microammeter to create a loop circuit.
Once you have the coil and microammeter connected, call over your instructor. She will perform an
experiment in which a magnet is moved into or out of the coil. The magnet is disguised so that you
do not know which end is the north pole. Your challenge is to use your observation of the needle on
the microammeter to figure out whether the marked end of the magnet is a north pole or a south pole.
Record any information, sketches, observations, etc. below so that you can complete your minireport.
Explanation / Answer
1.
If the magnet is moved into the coil, check the deflection of the microammeter.If the deflection is towards right, current is glowing in the anti-clockwise direction as seen from the magnet and the end that first enters the coil is the North pole.If the deflection is towards left, using similar reasoning, we can argue that the end that first enters the coil is the south pole.
2.
If the deflection is towards left, current is glowing in the clockwise direction as seen from the magnet and the end that first enters the coil is the South pole.If the deflection is towards left, using similar reasoning, we can argue that the end that first enters the coil is the North pole.
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