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Magnetism Chapter 8 Quiz

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Questions and Answers

What is a magnetic field?

The space around a compass needle

The region around a magnet where the magnetic force acts on magnetic materials (correct)

An imaginary line connecting the north and south poles of a magnet

The area where the pull of gravity is stronger

How can you tell if a metal bar is magnetic?

By observing it under a microscope

By dropping it in water to see if it floats

By placing iron fillings around it to observe the magnetic field pattern (correct)

By heating it up to see if it changes color

What creates the Earth's magnetic field?

Static electric charges on the Earth's surface

Movement of molten iron and nickel in the Earth's core producing electric currents and magnetic fields (correct)

The rotation of the Earth on its axis

The gravitational pull of the Moon on the Earth

What is the purpose of a compass on Earth?

To locate the Earth's magnetic North Pole Signup and view all the answers

How do magnets behave when opposite poles are brought close together?

They attract each other Signup and view all the answers

What is a line of force in magnetism?

An imaginary line originating from a magnet's north pole and ending at its south pole, indicating magnetic field strength Signup and view all the answers

What is the main characteristic of a magnetic field?

It is invisible but can be detected using iron fillings Signup and view all the answers

Why do magnetic field lines become denser when opposite poles of two magnets are brought closer?

The attraction between poles forces more field lines to pass through the region Signup and view all the answers

What contributes to making an electromagnet stronger?

Increase the thickness of the wire and add more coils Signup and view all the answers

Why is the Earth's magnetic field stronger at certain regions?

As a result of the Earth's molten iron core movement Signup and view all the answers

What is the significance of a compass needle having a north-seeking pole?

To help with navigation by pointing towards magnetic North Signup and view all the answers