Year 10 Physics Magnetism & Electromagnetism

What is this device called?

• Motor

• Electromagnet

• Dynamo

• Doorbell

A dynamo's disadvantage is that when a cyclist ​ (a)   ​ pedalling, the light turns ​ (b)   because the dynamo stops ​ (c)   . This can be dangerous at ​ (d)   because road traffic might not ​ (e)   the bike.

• stops
• off
• spinning
• night
• see

Reorder the following to explain how a dynamo works to light a lamp.

• As the magnetic field lines are cut by the wire...

• The iron core gains magnetism as the magnet spins inside.

• This changes the magnetic field constantly.

• ...a voltage is induced along the coil of wire.

• And this causes a current to flow and lights the lamp.

Tags

NGSS.MS-PS2-5

The iron core of an electromagnetic is described as 'soft' because...​ ​ (a)  

• It is easy to gain and lose its magnetism
• It is difficult to gain & lose its magnetism

Match the following

• Attract

• The magnetic field is weakest at the centre of a bar magnet

• False

• Two like poles will...

• Repel

• The ends of a bar magnet are called

• True

• The magnetic field is strongest at the poles

• Poles

• Two unlike poles will...

Tags

NGSS.3-PS2-4

This is a question worth [3 marks] in which the students were asked to draw the magnetic field lines around the bar magnets. How many points was it awarded?

• 0

• 1

• 2

• 3

Tags

NGSS.MS-PS2-3

This is a question worth [3 marks] in which the students were asked to draw the magnetic field lines around the bar magnets. Why did it lose 1 mark?

• The arrows are drawn in the wrong direction.

• The magnets should show attraction and not repulsion.

• Some of the magnetic field lines are untidy and cross each other.

• There should be fewer magnetic field lines.

Tags

NGSS.MS-PS2-3

This is a question worth [3 marks] in which the students had to draw the magnetic field lines around the two bar magnets. How many marks did it earn?

• 0

• 1

• 2

• 3

Tags

NGSS.MS-PS2-3

Why did this drawing lose [1 mark]?

• There shouldn't be a line in the centre connecting the two magnets.

• The arrows are pointing in the wrong direction.

• The poles are in the wrong places.

• The lines should be showing the magnets attracting.

To show the magnetic field around a magnet...

• ...tap gently on the paper to show the lines that form....

• ...sprinkle iron filings on paper over the magnet...

• ...place a plotting compass at various points around the magnet..

• ...and add the arrows to indicate the direction of the field lines.

Tags

NGSS.MS-PS2-5