What could Eric have changed in his electromagnet that caused the decrease in magnetic force from point A to point B? (You MUST give at least 3 possible reasons/changes in the electromagnet)
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One possible change is the number of coils or loops that are wrapped around the metal core that is being used.
Another way to decrease the magnetic force is by changing the current flowing through the electromagnet.
He could have also change the type of core metal he was using to make the decrease the magnetic force.
He could have also change the size of the wire he was using, a smaller wire will increase the resistance and reduce the current flowing weakening the field.
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One possible change is the number of coils or lose that are wrapped around the metal core that is being used. Another way to decrease the magnetic force is by changing the current flowing through the electromagnet. He could have also change the type of core metal he was using to make the decrease the magnetic force. He could have also change the size of the wire he was using, a smaller wire will increase the resistance and reduce the current flowing weakening the field.
There are multiple factors that could have contributed to the decrease in magnetic force from point A to point B in Eric's electromagnet. Here are three possible reasons/changes that could have caused this decrease:
1. Number of wire turns: The magnetic force in an electromagnet is directly proportional to the number of wire turns in the coil. If Eric removed or reduced the number of turns in his electromagnet's coil between point A and point B, it would result in a decrease in magnetic force.
2. Current strength: The magnetic force in an electromagnet is also directly proportional to the strength of the electric current passing through the coil. If Eric decreased the current strength flowing through the coil between point A and point B, it would result in a decrease in magnetic force.
3. Core material: The core material used in an electromagnet can greatly affect its magnetic force. If Eric changed the core material of the electromagnet between point A and point B, such as using a less magnetic material or introducing air gaps, it could lead to a decrease in magnetic force.
To determine the specific reason/change that caused the decrease in magnetic force from point A to point B, Eric could analyze these factors individually and check if any of these changes were made to his electromagnet.
turns of coil?
current?
hard to say, since you give such scant information
google electromagnets and read about their properties.