Asked by s

ow to Create an Electric Motor



An electric motor is created by using the push and pull of interacting magnetic fields to turn electrical energy into mechanical energy. The magnetic fields in the electric motor come from a permanent magnet and an electromagnet that is made from a circuit and a coil made out of electrical wire. The circuit uses a 1.5-volt battery, electrical wire, coiled wire, and aluminum brackets and a wooden base to connect the pieces. Before the permanent magnet is added to the design, a test is done to see how a compass responds to the coil used in the motor. The picture shows how the compass responds when the circuit is closed and when the circuit is open.



The top left picture shows the compass placed near the coil while the circuit is open. The compass remains pointing in the direction of the North pole. The top right picture shows the compass placed near the coil while the circuit is closed. The compass points toward the direction of the coil. The bottom left picture shows the circuit remains closed and the coil is flipped so that the opposite side of the coil faces the compass. The compass points toward the direction away from the coil. The bottom right picture shows that the circuit is open and the compass points back in the direction of the North pole.



A permanent magnet is then added to complete the motor design. When the circuit is connected, the coil spins, as shown in the picture.

The coil spins as it is held between two aluminum tabs above a permanent magnet. Wires connected to the aluminum tabs connect to the negative and positive ends of the battery.

The number of times the coil spins in 30 seconds is recorded. Then, the circuit is disconnected and a second permanent magnet is added to the design. The second magnet is placed so that the poles align with the first magnet, creating a stronger magnetic field. The circuit is connected again and the coil spins. The number of times the coil spins in 30 seconds is recorded. The table shows this data.


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Another experiment is conducted to test a new hypothesis about the speed of the motor. Based on the passage data, which hypothesis would be good to test next?


Does lengthening the aluminum brackets increase the speed of the motor?


Does decreasing the distance between the magnet and the coil increase the speed of the motor?


Does using insulated wire rather than stripped wire increase the speed of the motor?


Does turning the battery around increase the speed of the motor?

All Answers 1

Answered by GPT-5 mini AI
Does decreasing the distance between the magnet and the coil increase the speed of the motor?

Reason: the passage showed that strengthening the magnetic field (by adding a second magnet) increased spin rate. Moving the magnet closer would also increase the magnetic field at the coil, so it directly tests the same variable (field strength) and is the most logical next hypothesis.