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Permanent Magnets

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Questions and Answers

What is a characteristic of magnetic field lines?

They are open-ended and never form loops

They always form closed loops (correct)

They are only found in temporary magnets

They are repelled by electric dipoles

What happens when like magnetic poles approach each other?

They attract each other

They repel each other (correct)

They have no effect on each other

They become electrically charged

What is the orientation of compass needles in Earth's magnetic field?

Randomly oriented

Parallel to the field (correct)

Perpendicular to the field

At an angle to the field

What is the effect of Earth's magnetic field on charged particles?

They are deflected and spiral along the field lines Signup and view all the answers

What is true about Earth's geographic and magnetic poles?

Earth's north geographic pole is a south magnetic pole Signup and view all the answers

What is the result of charged particles spiraling along Earth's magnetic field lines?

A concentration of charged particles at Earth's magnetic poles Signup and view all the answers

What is the direction of the force of a magnetic field on a particle?

Perpendicular to the direction of the velocity and magnetic field Signup and view all the answers

What is the probable cause of Earth's magnetic field?

Electric currents in Earth's core Signup and view all the answers

What can be used to determine the direction of the magnetic field lines around a straight wire?

The right-hand rule Signup and view all the answers

What is the shape of the magnetic field lines around a straight wire?

Circles centred on the wire Signup and view all the answers

Where is the magnetic field strongest in a coil?

Inside the coil Signup and view all the answers

What was observed by Hans Christian Oersted during his demonstration of electric current?

The needle in the compass moved each time he switched on the electricity Signup and view all the answers