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WorksheetsMagnetic Fields and Forces - Day 11
Total questions: 18
Worksheet time: 17mins
Name
Class
Date
1.
An electron is moving north in a region where the magnetic field is south. The magnetic force exerted on the electron is:
a)
zero
b)
up
c)
north
d)
south
2.
A magnetic field exerts a force on a charged particle:
a)
always
b)
never
c)
if the particle is moving across the field lines
d)
if the particle is moving along the field lines
3.
An electron travels due north through a vacuum in a region of uniform magnetic field that is also directed due north. It will:
a)
be unaffected by the field
b)
speed up
c)
slow down
d)
follow a right-handed corkscrew path
4.
An electron and a proton are both initially moving with the same speed and in the same direction at 90˚ to the same uniform magnetic field. They experience magnetic forces, which are initially:
a)
identical
b)
equal in magnitude but opposite in direction
c)
in the same direction and differing in magnitude by a factor of 1840
d)
in opposite directions and differing in magnitude by a factor of 1840
5.
A hydrogen atom that has lost its electron is moving east in a region where the magnetic field is directed from south to north. It will be deflected:
a)
up
b)
down
c)
north
d)
south
6.
what is the earths magnetic field useful for
a)
deflecting the solar wind, charged particles that come from the Sun.
b)
wind
c)
sun
d)
light
7.
What will happen when these magnets are brought close together?
a)
They will attract each other.
b)
They will repel each other.
c)
Both magnets will turn to the left
d)
Both magnets will turn to the right
8.
What is our best evidence that Earth has a magnetic field?
a)
All things fall toward Earth's center
b)
A compass needle lines up with it
c)
Winds blow from east to west
d)
Earth's oceans all have currents
9.
Why does a compass needle point north?
a)
The compass is a bar magnet
b)
Because north is up
c)
Because it's magic
d)
It lines up with the Earth's magnetic field
10.
Where is the force of attraction the strongest on a magnet?
a)
at the poles
b)
in the middle
c)
above the magnet
d)
below the magnet
11.
The SI unit of magnetic field is
a)
weber
b)
guass
c)
tesla
d)
farad
12.
A wire carries a current out of the page. When viewed from above, what direction is the magnetic field?
a)
Out of the page
b)
Left
c)
Clockwise
d)
Counter-clockwise
13.
It is possible for a magnet to have only one pole.
a)
True
b)
False
14.
Are ALL metals magnetic?
a)
Yes
b)
No
15.
Are the magnetic field lines in the picture correct?
a)
Yes, because they point from north to south.
b)
No, because they point from north to south (they're supposed to go the other way).
c)
Yes, because the North pole is on the left in all pictures.
d)
No, because the North pole is on the left in all pictures (it's supposed to be on the right).
16.
The pole of a compass which points towards the Earth's south geographic pole is a
a)
magnetic north pole
b)
magnetic south pole
c)
positive charge pole
d)
magnetic barber pole
17.
What does the following represent?
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
a)
A crowd with binoculars
b)
A bunch of coaxial cables
c)
Uniform magnetic field directed into the screen away from you
d)
Uniform magnetic field directed out of your screen at you
18.
What does the following represent?
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗
a)
A crowd with binoculars
b)
A bunch of coaxial cables
c)
Uniform magnetic field directed into the screen away from you
d)
Uniform magnetic field directed out of your screen at you
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