Magnetic and Electric Field Review

Which of the two below result in an attractive force?

• A positive charge and a negative charge

• Two negative charges

• Two south poles

• A north pole and a south pole

• Two postive charges

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Two bar magnets are held close together. They are released and allowed to move freely. The bar magnets quickly come together. Which best explains why this happens?

• The poles facing one another are both south poles

• The poles facing one another are both north poles

• The poles facing one another are opposite poles

• One magnet was bigger than the other

To decrease the strength of a magnetic field around an electromagnet, we must

• increase the number of coils

• increase the size of the iron core

• decrease the size of the iron core

• decrease the number of coils

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_{^{The magnet's shown will}}

• not move

• attract

• repel

• all of the above

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Choose the words that will correctly complete the statement below about the relationship between distance and strength of the magnetic field: As the distance between magnets _____________, the repulsive force ______________.

• increases, increases

• increases, decrease

• decreases, decreases

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Describe the relationship between the number of coils and the strength of an electromagnet represented in the data table.

• The greater the number of coils, the weaker the electromagnet.

• There is no direct relationship between the number of coils and the strength.

• The fewer the coils, the stronger the electromagnet.

• The greater the number of coils, the stronger the electromagnet.

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_{^{The magnet's shown will}}

• not move

• attract

• repel

• all of the above

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Select all that apply: How can you make an magnetic force STRONGER?

• Bring the magnets closer together

• Move the magnets further away

• Increase the strength of the magnets

• Decrease the strength of the magnets

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Which of the following is NOT TRUE about magnetic fields:

• Magnetic fields are why object can be pushed/pulled without touching the magnet

• Field lines move from North to South

• The magnetic field is stronger when the field lines are closer together

• The field is stronger further away from the poles

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This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.

• Decrease the current running through the wire.

• Reverse the poles of the magnet.

• Remove all the coils and the nail.