Question

A circular coil of radius 10 cm and with 125 turns is initially oriented perpendicular to a uniform magnetic field of strength 2.50 mT directed out of the page. The wire carries a current of .250 A. a) Sketch the situation. b) Indicate the direction of the magnetic moment of the coil. c) What is the torque on the coil? d) if the coil was nudged so that it rotated with the left side of the coil into the page and the right side out of the page, is there a torque on the coil now? e) What will be the resulting motion of the coil? f) At what point will the torque on the coil be maximum? f) What is the maximum torque on the coil?

Answer #1

A circular coil with 200 turns has a radius of 2.0 cm. (a) What
current through the coil results in a magnetic dipole moment of 3.0
Am2 ? (b) What is the maximum torque that the coil will experience
in a uniform field of strength ? (c) If the angle between µ and B
is 45°, what is the magnitude of the torque on the coil? (d) What
is the magnetic potential energy of coil for this orientation?

A physics technician makes a circular coil consists of 120 turns
of copper wire with a resistance of 0.6 Ω. The coil radius is 6 cm.
the coil is connected to a 12 V battery. (a) Calculate the magnetic
moment of the coil. (b) If the coil was placed between the pole
faces of a magnet where the magnetic field strength was 0.5 T,
calculate the maximum torque on the coil.

A 80.0 turn circular coil of radius 5.00 cm can be oriented in
any direction in a
uniform magnetic field having a magnitude of 0.400 T. The coil
carries a current of 30.0 mA.
a) What is the magnitude of the maximum possible torque exerted on
the coil?
b) For the condition in part (a), what is the orientation
energy?

A circular coil of wire with 5 turns and a radius of 4.0 cm lies
flat on a table in a region where the magnetic field is 4.5 mT up.
The coil is flipped over in a time of 0.25 s. Is an emf induced in
the coil? If so, what is its average value?

A circular loop of radius 14 cm carries a current of 15 A. A
flat coil of radius 1.2 cm, having 65 turns and a current of 1.1 A,
is concentric with the loop. The plane of the loop is perpendicular
to the plane of the coil. Assume the loop's magnetic field is
uniform across the coil. What is the magnitude of (a) the magnetic
field produced by the loop at its center and (b) the torque on the
coil...

A flat circular coil having 15 turns, each of a radius of 18.0
cm, is in a uniform and steady 0.130-T magnetic field. The coil has
a resistance of 8.00
a) Find the total magnetic flux through one turn of the coil
when the field is parallel to the axis of the coil.
b) If the coil is rotated in 12.0 ms so its axis is
perpendicular to the field, find the average induced voltage and
the induced current in...

A circular coil of wire (N=10 turns) of radius 0.20 m is in a
uniform magnetic field of 0.50 T. The current in the loop is 4.0 A.
What is the magnetic torque when the plane of the loop is parallel
to the magnetic field?

2. A circular coil with 30 turns of wire has a diameter of 2.00
cm. The total resistance of the coil is 0.350 Ω. An applied uniform
magnetic field is directed upward, perpendicular to the plane of
the coil.
a) If the magnetic field changes linearly from 0.000 T to 0.800
T in 0.500 s, what is the induced emf in the coil while the field
is changing?
b) What is the magnitude and direction (CW or CCW when looked...

A flat circular coil with 96 turns, a radius of 3.72 10-2 m, and
a resistance of 0.432 Ω is exposed to an external magnetic field
that is directed perpendicular to the plane of the coil. The
magnitude of the external magnetic field is changing at a rate of
ΔB/Δt = 0.837 T/s, thereby inducing a current in the coil. Find the
magnitude of the magnetic field at the center of the coil that is
produced by the induced current.

A wire of length 74 cm is wound into a circular coil of 5 loops.
The coil carries a current 1.4 A. Find the maximum torque on the
coil in a uniform magnetic field of 2.3 T.

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