7.22.T - Lesson Review: Electricity & Magnets / Large & Small Magnets

Question 1

When drawing a magnetic field around a bar magnet, the lines are drawn closer together where the magnetic field is __________.
nonexistent
weaker
stronger
darker

Answer 1

stronger

Question 2

Ampere assumed that every atom was surrounded by electrons and behaved like a small electrical circuit. This created a constant magnetic field and made every atom behave like a small ________.
battery
electron
neutron
magnet

Answer 2

magnet

Question 3

Which of these is a common example of electrodynamics?
radio
loudspeaker
TV
dishwasher

Answer 3

loudspeaker

Question 4

What is the new field of study that Ampere invented to measure the current going through a wire?
electromagnetic
electrodynamics
voltage
amperage

Answer 4

electrodynamics

Question 5

The definition of an ampere or amp is ___________.
a unit of electrical resistance
a unit of electrical potential difference
a unit of electrical current
a unit of electrical force

Answer 5

a unit of electrical current

Question 6

When drawing a magnetic field around a bar magnet, the lines are drawn closer together where the magnetic field is ___________.
stronger
disappearing
appearing
weaker

Answer 6

stronger

Question 7

The best magnets are made of ___________.
alnico
aluminium
cobalt
iron

Answer 7

alnico

Question 8

If the bar magnet on the left were broken in half, what statement correctly predicts how the two halves of the magnet would react to the magnet on the right?

Neither half of the broken magnet would be attracted to the magnet on the right because a magnet must have two poles.

The right side of both halves would be attracted to the magnet on the right since the south pole of each half would be facing the north pole of the other magnet.

The two halves of the broken magnet would be attracted to each other, but neither would be attracted to the magnet on the right.

Only the right side of the broken magnet would be attracted to the magnet on the right since it contains the south-oriented magnetic domains.

Answer 8

The right side of both halves would be attracted to the magnet on the right since the south pole of each half would be facing the north pole of the other magnet.

Question 9

A magnetic force or magnetic field is nothing but an electrostatic field moving ___________.
in an erratic way
very slowly
very fast
methodically

Answer 9

very fast

Question 10

The Earth’s core is a churning ball of liquid __________ and _________.
nickel
iron
phosphorus
aluminum

Answer 10

nickel
iron