Magnetism

Observe the electromagnets below. Which solenoid would create a stronger magnetic field?

• A, It has less coils in the solenoid

• B, It has more coils in the solenoid

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Click on the image and answer the question.

• A

• B

• C

• D

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The nail in the diagram of an electromagnet is called a _____________.

• soleoid

• ferromagnetic core

• power source

Using a stronger battery will add more electric current and create a stronger electromagnet.

• True

• False

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Two south magnetic poles that are brought near each other ____________________.

• attract

• shake hands

• thumb wrestle

• repel

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Magnetic force and gravitational force are examples of _____________________.

• contact forces

• magic

• non-contact forces

• holla-ballew

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In North America, many species of birds fly south during the winter to live in warmer temperatures. These birds have an internal compass that allows them to navigate to their winter homes. The inner compass of a bird is aligned with the ___________________ to help them navigate. 

• 1. The gravitational field of Earth

• The magnetic field of Earth

• The gravitational field of the Moon

• The magnetic field of the ocean currents

Where is the weakest part of the magnetic field on the magnet in the image?

• The north pole

• The south pole

• The sides of the magnet

• none of the above

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The wire with loops in the diagram of an electromagnet is called a _____________.

• soleoid

• ferromagnetic core

• power source

Electromagnets can be turned on and off by adding or removing electric current.

• True

• False