The magnetic field perpendicular to a circular wire loop 7.7
cmcm in diameter is changed from...
The magnetic field perpendicular to a circular wire loop 7.7
cmcm in diameter is changed from +0.44 TT to -0.27 TT in 150 msms ,
where + means the field points away from an observer and - toward
the observer.
A 20-cmcm-diameter circular loop of wire is placed in a 0.64-T
magnetic field.
a) When the plane of the loop is perpendicular to the field
lines, what is the magnetic flux through the loop?
Express your answer to two significant figures and include the
appropriate units.
b) The plane of the loop is rotated until it makes a
45 angle with the field lines. What is the angle in the
equation ΦB = BAcosθ for this situation?
Express your answer using...
A fixed 17.1-cmcm-diameter wire coil is perpendicular to a
magnetic field 0.70 TT pointing up. In 0.16 ss , the field is
changed to 0.34 TT pointing down. What is the average induced emf
in the coil?
A circular loop of 22 turns and 46.3 cm diameter is directed
perpendicular to a magnetic field of 356 mT. The wire itself has a
diameter of 4.2 mm and is made of copper. If the magnetic field is
uniformly decreased from 356 mT to zero, how much charge moves past
a single point on the coil during this time?
A 9.0-cmcm -long wire is pulled along a U-shaped conducting rail
in a perpendicular magnetic field. The total resistance of the wire
and rail is 0.31 ΩΩ . Pulling the wire with a force of 1.1 NN
causes 3.5 WW of power to be dissipated in the circuit.
Part A
What is the speed of the wire when pulled with 1.1 N? Express
your answer in meters per second
Part B
What is the strength of the magnetic field? Express...
A circular wire loop of radius 1.4 cm is placed in a magnetic
field of magnitude 2.3 T. If the magnetic field goes to zero in a
time of 5 s, what is the magnitude of the current induced in the
loop? The wire has a diameter of 2 mm, and the resistivity of
copper is 1.7 x 10-8 Ohm-m.
The figure below displays a circular loop of nickel wire in a
uniform magnetic field pointing into the page. The radius of the
loop is 10.0 cm and the magnitude of the field is 0.160 T. You grab
points A and B and pull them in opposite
directions, stretching the loop until its area is nearly zero,
taking a time of 0.210 s to do so. What is the magnitude of the
average induced emf in the loop (in mV)...
Shrinking Loop. A circular loop of flexible
iron wire has an initial circumference of 168 cmcm , but its
circumference is decreasing at a constant rate of 10.0 cm/s due to
a tangential pull on the wire. The loop is in a constant uniform
magnetic field of magnitude 0.800 T , which is oriented
perpendicular to the plane of the loop. Assume that you are facing
the loop and that the magnetic field points into the loop.
Find the magnitude...
An electron moves in a circular path perpendicular to a uniform magnetic field with a magnitude of 2.14 mT. If the speed of the electron is 1.48 107 m/s, determine the following.
(a) the radius of the circular path
............ cm
(b) the time interval required to complete one revolution
............ s
A magnetic field is perpendicular to the plane of a single-turn
circular coil. The magnitude of the field is changing, so that an
emf of 0.25 V and a current of 2.5 A are induced in the coil. The
wire is then re-formed into a single-turn square coil, which is
used in the same magnetic field (again perpendicular to the plane
of the coil and with a magnitude changing at the same rate). What
(a) emf and (b) current are...
A magnetic field is perpendicular to the plane of a single-turn
circular coil. The magnitude of the field is changing, so that an
emf of 0.81 V and a current of 3.8 A are induced in the coil. The
wire is then re-formed into a single-turn square coil, which is
used in the same magnetic field (again perpendicular to the plane
of the coil and with a magnitude changing at the same rate). What
(a) emf and (b) current are...