Download Concept Questions

Electromagnetism Review
I
II
Name ___________________
III
IV
V
VI
VII
Use the above field lines to answer the following ten questions.
1) Which of the above could be field lines for gravity?
a) I, VII
b) IV, VII
c) I, IV
d) I, IV, VII
2) Which is true about I? This could be the field lines for
a) electricity
b) magnetism
c) gravity
d) all three
3) Which could represent the field lines of a current carrying wire?
a) II, III
b) II, V
c) III, V
d) all three
4) Which is true about IV? This could be the field lines for
a) electricity
b) magnetism
c) electricity or magnetism
d) neither electricity nor magnetism
5) Which is true about III? This could be the field lines for
a) a magnet
b) a solenoid
c) both
d) neither
6) Which is true about VII? This could be the field lines
a) between charged plates, inside a solenoid
b) near the Earth, inside a solenoid
c) near the Earth, between charged plates
d) all three
7) Which is true about VI? This could be the field lines for
a) electricity
b) magnetism
c) electricity or magnetism
d) neither electricity nor magnetism
8) Which is true about II? This could be the field lines for
a) electricity
b) gravity
c) niether
d) both
9) Which of the above are possible magnetic field lines? All except
a) I, IV
b) I, VI
c) IV, VI
d) I, IV, VI
10) A really good electromagnet will have
a) many turns, an iron core
c) many turns, a plastic core
b) many turns per cm, an iron core
d) many turns per cm, a plastic core
11) Magnetism differs from both electricity and gravity because magnetism
a) only acts on a few elements
b) does not follow an inverse square law
c) has continuous field lines
d) all of the above
12) Magnetism is similar to electricity, but different from gravity, because magnetism and electricity
a) can be affected by charges
b) can attract and repel
c) are not affected by mass
d) all of the above
13) What is true about all field lines? They
a) form loops
c) show the path that a particle will follow
b) radiate from charges or masses
d) never cross
14) A charged particle that is travelling in a field that is uniform will travel in circular motion if the field is
a) gravitational
b) magnetic
c) electrical
d) gravitational or electrical
15) A magnetic field that is uniform can be found
a) around a current carrying wire
c) outside a current carrying solenoid
b) around a current carrying loop
d) inside a current carrying solenoid
16) A magnetic field will cause a charge to move in a circle if the charge is moving
a) perpendicular to the field and the field is constant
b) parallel to the field and the field is constant
c) perpendicular to the field and the field is increasing
d) parallel to the field and the field is increasing
17) An electron is moving north through a magnetic field that is south. It experiences
a) a force down
b) a force up
c) a force west
d) no force
18) A current is flowing north in a magnetic field that is west. It experiences
a) a force down
b) a force up
c) a force west
d) no force
19) A magnet is pushed N pole first into the top of a coil. As a result a galvanometer needle moves to the
right. The needle will move left when the magnet is then
a) pulled out the bottom
b) pulled back out the top
c) held stationary
d) both answers a) and b)
20) A magnet is dropped down a copper tube and it falls much slower than an otherwise identical but demagnetised magnet did. This is because the magnet
a) is repelled by a permanent magnetic field
b) is repelled by an induced magnetic field
c) experiences more air resistance
d) both answers b) and c)
21) It is possible to shield materials from the following fields
a) magnetic, electrical b) gravitational, electrical c) gravitational, magnetic
d) all three
22) A charged particle is placed in a uniform magnetic field. When released it will exhibit constant
a) acceleration
b) velocity
c) speed
d) position
23) Particles with the same q and m enter a uniform magnetic field at right angles. The radius of curvature is
a) greater for the faster particle
b) smaller for the faster particle
c) the same for all the particles
d) infinite, the paths are straight
24) Parallel wires with current in opposite directions will
a) be attracted to each other
b) repel each other
c) not affect each other
d) attract then repel each other.
25) The current flowing in your house is unlikely to affect a compass needle because the wires are
a) far apart, in varying directions
b) insulated with plastic, in varying directions
c) insulated with plastic, far apart
d) all three
20) Two wires carry current as shown. One wire is slightly above the other. Which region has the
strongest field pointing out of the page?
a)
b)
c)
d)
21) When a charged particle is fired into a uniform magnetic field at an angle of 90o, it moves along a
a) circular path
b) straight path
c) parabolic path
d) spiral path
22) Charged particles will go straight in a velocity selector when the following are equal in magnitude
a) mass and charge
b) electric force and magnetic force
c) electric field and magnetic field
d) both answers b) and c)
23) The magnetic field outside a solenoid is
a) inversely proportional to r
c) directly proportional to r
b) inversely proportional to r2
d) really complicated
24) The magnetic field outside a co-axial cable is
a) inversely proportional to r
c) directly proportional to r
b) inversely proportional to r2
d) zero
Diagrams
25) Draw force diagrams of
a) A car going around a circular turn on a flat surface at constant/increasing speed
b) A satellite orbiting the Earth in a circular/elliptical orbit
c) A ball swung on a string in a vertical/horizontal circle.
26) Draw force diagrams and paths of
d) An electron moving perpendicular to a constant electric field.
e) An electron moving perpendicular to a constant magnetic field.
27) Draw force diagrams and fields for
a) A hydrogen ion in the TRIUMF cyclotron when between the dees.
b) An ion passing through a mass spectrometer
c) An electron and an old computer monitor.
d) A particle going through a velocity selector.
28) Draw diagrams with field lines etc. for
a) cyclotron
b) velocity selector
c) mass spectrometer
d) electron gun