Question

To find the torque on a current carrying flat loop of wire in a
uniform magnetic field you need to multiply the current times the
cross product of the area vector of the loop with the magnetic
field vector -- I ( **A** x **B** ). How
would you determine the magnitude and direction of the area vector
**A** ? What would happen to the loop if it were
placed in the magnetic field with **A** perpendicular
to **B** and were free to move? If you were making an
electric motor and wanted to loop to keep rotating, in simple
terms, what would you do.

Answer #1

Magnitude of area of loop is found using simple geometry, means using formula for the area of loop whether it is a circle, square or rectangle. Its direction is given by a normal drawn at the plane of the loop.

When loop is placed in the magnetic field such that its plane is perpendicular to the magnetic field, than direction of area vector becomes parallel to magnetic field so torque acting on it becomes zero. But if area vector is perpendicular to magnetic field, it experiences maximum torque.

In case of electric motor, to rotate the loop completely, there should be a split ring assembly attached with this loop.

The magnetic torque exerted on a flat current carrying loop of
wire by a uniform magnetic field is: Select one: a. maximum when
the plane of the loop is perpendicular to the magnetic field b.
minimum when the plane of the loop is perpendicular to the magnetic
field c. independent of the orientation of the loop d. maximum when
the plane of the loop at an 45 to the magnetic field e. minimum
when the plane of the loop is...

A flat,106 turn current‑carrying loop is immersed in a uniform
magnetic field. The area of the loop is 5.95×10−4 m2, and the angle
between its magnetic dipole moment and the field is 43.1∘. Find the
strength of the magnetic field that causes a torque of 1.53×10−5
N⋅m to act on the loop when a current of 0.00395 A flows in it.

A flat, 118‑turn, current‑carrying loop is immersed in a uniform
magnetic field. The area of the loop is 8.09 cm2 and the angle
between its magnetic dipole moment and the field is 50.9∘. Find the
strength of the magnetic field that causes a torque of 2.39×10−5
N⋅m to act on the loop when a current of 3.81 mA flows in it.

a) A current loop in a uniform magnetic field experiences
A net force and net torque
A net force
A net torque
b) A current loop in an external magnetic field will rotate so
that its own magnetic field is
perpendicular to the external field
parallel to the external field
anti-parallel to the external field
c) Is the simple motor motion similar to the simple pendulum
motion?
the loop rotates back and forth about an equilibrium
point.
No
Yes
d)...

The illustration below shows a loop of wire with area A and a
uniform magnetic field B that goes through the loop. (The field
fills the whole area of the page, but it is simpler to make one
drawing.) The area vector and B-field direction are both in the
plane of the page. The loop is perpendicular to it, but drawn in a
perspective view so that you can see it is a loop. The B-field has
a constant magnitude...

1.
A straight current-carrying wire in a uniform magnetic field
experiences a magnetic force
a
only if the wire is moving.
b
only if the wire is parallel to the field.
c
parallel to the wire.
d
perpendicular to the wire.
2.
Magnetic field strength is greater
a
where the field lines are closer together.
b
where the field lines are further apart.
c
where the field lines are evenly spaced.
d
where the field lines cross.
3.
A moving,...

A
single loop of aluminum wire, lying flat in a plane, has an area of
8.00 cm2 and a resistance of 2.50 Ω. A uniform magnetic field
points perpendicular to the plane of the loop. The field initially
has a magnitude of 0.500 T, and the magnitude increases linearly to
2.00 T in a time of 2.00 s. What is the induced current (in mA) in
the loop of wire over this time?

A circular conductive loop of wire sits a centimeter away from a
straight, infinitely-long current-carrying wire. For each of the
following scenarios, predict the outcome and explain how you made
this prediction.
(a)The loop sits stationary near the wire and does not move. The
magnitude and direction of the current in the current-carrying wire
does not change. Is there an induced magnetic field in the
loop?
(b)The loop begins to move toward the infinitely-long
current-carryingwire. Is there an induced magnetic...

A circular wire loop whose radius is 16.0 cm carries a current
of 2.58 A. It is placed so that the normal to its plane makes an
angle of 41.0° with a uniform magnetic field of 1.20 T. The initial
torque on the current loop will make the magnetic dipole moment
vector Will it?:
A. Try to align against the magnetic field
B. Try to align with the magnetic field.
C .There will be no torque on the loop
Then...

A
circular loop of wire is perpendicular to a 0.16 T uniform magnetic
field. The magnetic flux through the loop is 24 mWb. What is the
radius of the loop?

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 5 minutes ago

asked 20 minutes ago

asked 22 minutes ago

asked 23 minutes ago

asked 23 minutes ago

asked 27 minutes ago

asked 27 minutes ago

asked 37 minutes ago

asked 46 minutes ago

asked 59 minutes ago

asked 1 hour ago

asked 1 hour ago