Download Chapter 18 clicker questions

Chapter 18 Clickers
Electromagnetic
Induction
Prepared by
Dedra Demaree,
Georgetown University
© 2014 Pearson Education, Inc.
Voting question
If explanation 2 is correct, then if a bar magnet is
placed near a coil but is not moving, such that the
magnetic field lines of the bar magnet pass through
the coil but are unchanging:
a) A constant current will be induced.
b) No current will be induced.
© 2014 Pearson Education, Inc.
Voting question
If explanation 2 is correct, then if a bar magnet is
placed near a coil but is not moving, such that the
magnetic field lines of the bar magnet pass through
the coil but are unchanging:
a) A constant current will be induced.
b) No current will be induced.
© 2014 Pearson Education, Inc.
Voting question
Which of the loops immediately experiences a changing
number of field lines as they move to the right?
a) All of them
b) 1, 2, and 4
c) 3
d) 1 and 2
© 2014 Pearson Education, Inc.
Voting question
Which of the loops immediately experiences a changing
number of field lines as they move to the right?
a) All of them
b) 1, 2, and 4
c) 3
d) 1 and 2
© 2014 Pearson Education, Inc.
Voting question
A current will be induced in a coil of wire if:
a) The area of the coil is changed.
b) The orientation of the magnetic field relative to the
coil is changed.
c) The strength of the magnetic field in the vicinity of
the coil is changed.
d) All of the above.
© 2014 Pearson Education, Inc.
Voting question
A current will be induced in a coil of wire if:
a) The area of the coil is changed.
b) The orientation of the magnetic field relative to the
coil is changed.
c) The strength of the magnetic field in the vicinity of
the coil is changed.
d) All of the above.
© 2014 Pearson Education, Inc.
Voting question
The magnetic flux increases if:
a) The strength of the magnetic field increases.
b) The area of the loop decreases.
c) The angle between the normal vector of the loop
and the magnetic field increases.
d) All of the above.
© 2014 Pearson Education, Inc.
Voting question
The magnetic flux increases if:
a) The strength of the magnetic field increases.
b) The area of the loop decreases.
c) The angle between the normal vector of the loop
and the magnetic field increases.
d) All of the above.
© 2014 Pearson Education, Inc.
Voting question
If the north pole of a bar magnet moves away from a
loop of wire, the flux in the wire:
a) Increases.
b) Decreases.
c) Does not change.
© 2014 Pearson Education, Inc.
Voting question
If the north pole of a bar magnet moves away from a
loop of wire, the flux in the wire:
a) Increases.
b) Decreases.
c) Does not change.
© 2014 Pearson Education, Inc.
Voting question
If the flux in a loop of wire increases, the induced
magnetic field in the wire must:
a) Point in the same direction as the external
magnetic field.
b) Point in the opposite direction as the external
magnetic field.
c) There is no induced magnetic field.
© 2014 Pearson Education, Inc.
Voting question
If the flux in a loop of wire increases, the induced
magnetic field in the wire must:
a) Point in the same direction as the external
magnetic field.
b) Point in the opposite direction as the external
magnetic field.
c) There is no induced magnetic field.
© 2014 Pearson Education, Inc.
Voting question
If the flux in a loop of wire decreases, the induced
magnetic field in the wire must:
a) Point in the same direction as the external
magnetic field.
b) Point in the opposite direction as the external
magnetic field.
c) There is no induced magnetic field.
© 2014 Pearson Education, Inc.
Voting question
If the flux in a loop of wire decreases, the induced
magnetic field in the wire must:
a) Point in the same direction as the external
magnetic field.
b) Point in the opposite direction as the external
magnetic field.
c) There is no induced magnetic field.
© 2014 Pearson Education, Inc.
Voting question
The emf induced in a coil increases if:
a) The area of the loop decreases.
b) The time it takes for the magnetic flux to change
increases.
c) The change in magnetic flux increases.
d) All of the above.
© 2014 Pearson Education, Inc.
Voting question
The emf induced in a coil increases if:
a) The area of the loop decreases.
b) The time it takes for the magnetic flux to change
increases.
c) The change in magnetic flux increases.
d) All of the above.
© 2014 Pearson Education, Inc.
Voting question
A single loop of wire is oriented so that the magnetic
field is parallel to the normal vector of the loop. If the
magnetic field changes from 0 T to 4 T in 2 s, and the
area of the loop is 0.5 m2, what is the emf induced in
the loop?
a) 0.5 V
b) 1 V
c) 2 V
d) 4 V
© 2014 Pearson Education, Inc.
Voting question
A single loop of wire is oriented so that the magnetic
field is parallel to the normal vector of the loop. If the
magnetic field changes from 0 T to 4 T in 2 s, and the
area of the loop is 0.5 m2, what is the emf induced in
the loop?
a) 0.5 V
b) 1 V
c) 2 V
d) 4 V
© 2014 Pearson Education, Inc.
Voting question
Motional emf will be larger if:
a) The rod is moved faster.
b) The magnetic field is stronger.
c) The rod is longer.
d) All of the above.
© 2014 Pearson Education, Inc.
Voting question
Motional emf will be larger if:
a) The rod is moved faster.
b) The magnetic field is stronger.
c) The rod is longer.
d) All of the above.
© 2014 Pearson Education, Inc.
Voting question
A 1-m-long rod is moving perpendicular to a magnetic
field with a constant speed of 10 m/s. The magnitude
of the magnetic field is 2 T. What is the motional emf?
a) 0 V
b) 5 V
c) 10 V
d) 20 V
© 2014 Pearson Education, Inc.
Voting question
A 1-m-long rod is moving perpendicular to a magnetic
field with a constant speed of 10 m/s. The magnitude
of the magnetic field is 2 T. What is the motional emf?
a) 0 V
b) 5 V
c) 10 V
d) 20 V
© 2014 Pearson Education, Inc.
Voting question
A simple electric generator works by:
a) Changing the area of a loop in an external
magnetic field.
b) Changing the magnitude of the external magnetic
field through a loop.
c) Changing the orientation of a loop in an external
magnetic field.
d) None of the above.
© 2014 Pearson Education, Inc.
Voting question
A simple electric generator works by:
a) Changing the area of a loop in an external
magnetic field.
b) Changing the magnitude of the external magnetic
field through a loop.
c) Changing the orientation of a loop in an
external magnetic field.
d) None of the above.
© 2014 Pearson Education, Inc.
Voting question
The induced emf in an electric generator decreases if:
a) The loop rotates faster.
b) There are more coils of wire in the loop.
c) The area of the loop gets bigger.
d) The external magnetic field gets smaller.
e) None of the above.
© 2014 Pearson Education, Inc.
Voting question
The induced emf in an electric generator decreases if:
a) The loop rotates faster.
b) There are more coils of wire in the loop.
c) The area of the loop gets bigger.
d) The external magnetic field gets smaller.
e) None of the above.
© 2014 Pearson Education, Inc.
Voting question
The induced current in a generator is:
a) Alternating because the coil continuously rotates,
flipping its orientation with respect to the external
magnetic field every half-turn.
b) Constant because the flux constantly changes as
the coil continuously rotates.
c) Neither of the above.
© 2014 Pearson Education, Inc.
Voting question
The induced current in a generator is:
a) Alternating because the coil continuously
rotates, flipping its orientation with respect to
the external magnetic field every half-turn.
b) Constant because the flux constantly changes as
the coil continuously rotates.
c) Neither of the above.
© 2014 Pearson Education, Inc.
Voting question
Your laptop requires a 20−V emf to function. What
should be the ratio of the primary coil turns to the
secondary coil turns if this transformer is to be plugged
into a standard house AC outlet (120−V emf)?
a) 6
b) 20
c) 120
d) 2400
© 2014 Pearson Education, Inc.
Voting question
Your laptop requires a 20−V emf to function. What
should be the ratio of the primary coil turns to the
secondary coil turns if this transformer is to be plugged
into a standard house AC outlet (120−V emf)?
a) 6
b) 20
c) 120
d) 2400
© 2014 Pearson Education, Inc.
Voting question
Which of the following statements is correct?
a) A moving electric charge produces a magnetic
field.
b) An electric charge has a corresponding electric
field.
c) A changing magnetic field produces an electric
field.
d) All of the above are correct.
© 2014 Pearson Education, Inc.
Voting question
Which of the following statements is correct?
a) A moving electric charge produces a magnetic
field.
b) An electric charge has a corresponding electric
field.
c) A changing magnetic field produces an electric
field.
d) All of the above are correct.
© 2014 Pearson Education, Inc.