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26 Nov 2019

Suppose you are holding a circular ring of wire and suddenly thrusta magnet, south pole first, away from youtoward the center of thecircle. Is a current inducedin the wire? Is a current induced whenthe magnet is held steady withing the ring? Is a currentinducedwhen you withdraw the magnet? in each case, if youransweris yes, specify the direction

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Jarrod Robel
Jarrod RobelLv2
21 Feb 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

1)A) A metal wire loopis placed in a uniform magnetic field asshown. Determine thedirection of the induced current in the top ofthe loop in eachcase below and explain why.
a) The loop isstationary.
b) The loop is moving towards theright.
c) The loop is movingupwards.
A metal wire loop is in front ofteh north pole of a magnet asshown. Determine the directionof the induced current in the top ofthe loop in each case belowand explain why.

d) The loop isstationary.
e) The loop is moving towards theright.
f) The loop is movingupwards.
B) All of the resistors in thecircuits below are identical at2 ohlms each. The batteriesare ideal with voltages of 12 and 6volts as shownbelow.

a) Rank the current passing in the upper right hand corner ofeachcircuit from greatest to least.
b) Rank the voltage in the upper right hand corner of eachcircuitwith respect to the voltage at the point X inthecircuit.

1a) Faraday discovered that a current is induced in a coil

A) only when the N pole of a magnet is inside the coil
B) only when the S pole of a magnet is inside the coil
C) only when there is a magnetic field inside the coil
D) only when the magnetic field inside the coil is changing

1b). A conductor moves through a uniform magnetic field at speed v and has a motional emf V created across it. If the conductor were to move twice as fast through the magnetic field, the motional emf would be:

A) V
B) 2V
C) 4V
D) V/2
E) V/4

1c) In the conducting rail discussed in section 25.2 (where the rail is moving at constant speed), what can you say about the power input due to the person pulling on the rail and the power dissipated in the resistance?

A) Power input from pull = power dissipated in R
B) Power input from pull > power dissipated in R
C) Power input from pull < power dissipated in R

1d) The electric generator as shown in the reading generates electricity by:

A) rotating a loop inside a magnetic field
B) moving a magnet in and out of a loop
C) sliding a loop over a magnet
D) running current through a loop in a magnetic field

1e) The magnetic flux through a loop:

A) is proportional to the number of magnetic field lines going through it
B) depends just on the B field going through the loop
C) is maximized when the B field lines in the plane of the loop
D) is zero when the B field is perpendicular to the plane of the loop
E) doesn't depend on the direction of the B field

1f) According to Lenz's Law, the induced B field (due to the induced current) will:

A) be in the opposite direction of the existing B field
B) be in the same direction as the existing B field
C) be in the same direction as the change in the existing B field
D) be in the opposite direction of the change in the existing B field

1g) A stationary coil experiences a doubling of its magnetic field (no change in direction of the field) in a time T and has a given induced EMF. If the same change were to have happened in half the time (T/2), the induced EMF would have been:

A) half as large
B) the same
C) twice as large
D) one-fourth as large
E) four times as large

1h) Eddy currents:

A) make it hard to pull a nonmagnetic material through a magnetic field
B) make it hard to pull a magnetic material through a magnetic field
C) speed up a magnetic material moving through a magnetic field
D) speed up a nonmagnetic material moving through a magnetic field

 

 

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