Explain why the coil spins I. Coil as magnet 1) Unwind the magnet wire from the

Question

Explain why the coil spins I. Coil as magnet 1) Unwind the magnet wire from the coil until there is about 7-8 cm on each end. Cut the wire off back to where the enamel is undisturbed. Use the ends to bind the coil back together and come out on opposite sides of the coil, as shown. Instructor will demonstrate. 2) Scrape the enamel completely off one of the ends of your coil. Enamel 3) On the second end, scrape the enamel off only on one side of the wire as shown. Your instructor will explain. -No enamel 4) Place the coil in the wire holders on the motor mount board. The scraped off parts of the wire should make electrical contact with the paper clips when the coil is vertical. Adjust coil for smooth rotation. 5) Connect the power supply to the paper clip holders. Turn on the power to the circuit. Set the voltage to 4.0V and turn the current knobs to maximum. (Note: the coil may get hot,so pay attention to not 6) While current is flowing and the coil is in the vertical position, hold the compass flat inside the center of the coil and note the direction of the compass needle. Reverse the direction of the current and note any changes in the compass needle. Use this information and the direction of the current in the wire to confirm the RHR for coils. Explain how this confirms the RHR for coils:

Explanation / Answer

1)According to Right hand rule for coils, when you place your right hand over the coil, with your fingers wrapped in the direction of current flow through the coil, your thumb will then point to the magnetic north, when you place a magnetic compass closer to the thumb ,as unlike poles get attracted, the compass points South.

When the direction of current is reversed, the deflection of the compass also changes, hence this confirms the right hand rule for coils.

2) Due to the flowing current, magnetic field is also set around the coil when you place magnets on opposite sides of coil unlike poles get attracted say, coil north pole attracts south pole of magnet due to which it rotates through an angle of 180 degrees whereas the south pole of coil attracts the north pole of magnet hence it completes remaining 180 degrees of rotation, thus the coil rotates on its own.

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