Question

A butterfly is perched on a horizontal length of current-carrying
wire.
The wire is oriented at right angles to a uniform magnetic field
that is just strong enough to support the weight of the butterfly
and the wire. The butterfly has a mass of 1.5 g and the wire has a
mass of 5 g and a length of 10 cm. If the magnitude of the current
is 1.6 A directed to the left, what is the magnitude of the
magnetic field and which way does it point?

0.16T, outwards

0.16T, inwards

0.25T, outwards

0.40T, inwards

0.40T, outwards

None of these

Answer #1

A horizontal current-carrying wire that is perpendicular to the
plane of the paper is placed in a uniform magnetic field of
magnitude 2.8 mTmT that is parallel to the plane of the paper and
points down. At the distance 1.0 cmcm to the right of the wire, the
total magnetic field is zero.
A.
What is the direction of the current in the wire if the zero
point is 0.4 to the left of the wire?
Into the page.
Out of...

A 1.8 m length of wire carrying 4.6 A of current toward the
south is oriented horizontally. At that point on the Earth's
surface, the dip angle of the Earth's magnetic field makes an angle
of 46 to the wire. Estimate the magnitude of the magnetic force on
the wire due to the Earth's magnetic field of 5.5×10−5T5.5×10−5T at
this point. Express your answer using two significant figures.

A current carrying wire is in the shape of an equilateral
triangle of edge length 5.0 cm. The triangle lies in the z
= 0 plane. The wire carries a current of 2.6 A.
(a) What is the magnitude of the torque on the wire if it is in
a region with a uniform magnetic field of magnitude 0.32 T that
points in the +z direction?
___ N·m
(b) What is the magnitude of the torque on the wire if...

A current-carrying wire is in the shape of a square of edge
length 5.0 cm. The square lies in the z = 0 plane. The
wire carries a current of 2.1 A.
(a) What is the magnitude of the torque on the wire if there is
a uniform magnetic field of magnitude 0.28 T in the +z
direction?
(b) What is the magnitude of the torque if the field is in the
+x direction?

A long, straight wire carrying 1.5 A of current to the left is
placed above a large, flat sheet through which the current per unit
width is 4.0 A/m to the left.
Part A
What is the magnitude of the magnetic force exerted on each
1.0-m length of the wire?
FB/? = N/m
Part B
What is the direction of the magnetic force?
The magnetic force is downward.
The magnetic force is directed to the right.
The magnetic force is...

A current carrying wire is in the shape of an equilateral
triangle of edge length 4 cm. The triangle lies in the z =
0 plane. The wire carries a current of 2.2 A.
1)
What is the magnitude of the torque on the wire if it is in a
region with a uniform magnetic field of magnitude 0.32 T that
points in the +z direction?
N·m
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submission are allowed....

A wire 2.80 m in length carries a current of 4.20 A in a region
where a uniform magnetic field has a magnitude of 0.240 T.
Calculate the magnitude of the magnetic force on the wire assuming
the following angles between the magnetic field and the
current.
(a)60.0 degrees
(b)90.0 degrees
(c)120 degrees

Consider a straight piece of copper wire of length 2 m and
diameter 8.5 mm that carries a current I = 9 A. There is a magnetic
field of magnitude B directed perpendicular to the wire, and the
magnetic force on the wire is just strong enough to “levitate” the
wire (i.e., the magnetic force on the wire is equal to its weight).
Find B. Hint: The density of copper is 9000 kg/m3 .

A horizontal wire is hung from the ceiling of a room by two
massless strings. The wire has a length of 0.22 m and a mass of
0.009 kg. A uniform magnetic field of magnitude 0.075 T is directed
from the ceiling to the floor. When a current of I = 31 A exists in
the wire, the wire swings upward and, at equilibrium, makes an
angle φ with respect to the vertical, as the drawing shows. Find
(a) the...

A long horizontal wire carrying a current of 300A is held in
place above another horizontal wire with a current of 200A in the
opposite direction. If the top wire is allowed to fall under
gravity, determine the distance (in centimeters) from the fixed
wire at which the acceleration of the top wire goes to zero. Assume
that the top wire has a mass per unit length of 55 g/m.

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