Question

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 the page. |

Direction cannot be uniquely determined. |

B.

What is the magnitude of the current in the wire if the zero field point is 0.4 cmcm to the left of the wire?

Answer #1

A long wire carrying a 4.0 A current perpendicular to the
xy-plane intersects the x-axis at x=−2.2cm. A second, parallel wire
carrying a 2.8 A current intersects the x-axis at x=+2.2cm
A) At what point on the x-axis is the magnetic field
zero if the two currents are in the same direction?
B) At what point on the x-axis is the magnetic field
zero if the two currents are in opposite directions?

A long wire carrying a 5.0 A current perpendicular to the
xy-plane intersects the x-axis at
x=−2.0cm . A second, parallel wire carrying a 3.5 A
current intersects the x-axis at x=+2.0cm
At what point on the x-axis is the magnetic field zero
if the two currents are in the same direction?
At what point on the x-axis is the magnetic field zero
if the two currents are in opposite directions?

A long wire carrying a 5.0 A current perpendicular to the
xy-plane intersects the x-axis at x=−2.0cm. A second, parallel wire
carrying a 2.0 A current intersects the x-axis at x=+2.0cm.
A) At what point on the x-axis is the magnetic field zero if the
two currents are in the same direction?
B) At what point on the x-axis is the magnetic field zero if the
two currents are in opposite directions?

A long wire carrying a 4.5 A current perpendicular to the
xy-plane intersects the x-axis at x=−2.0cm. A second, parallel wire
carrying a 3.0 A current intersects the x-axis at x=+2.0cm.
At what point on the x-axis is the magnetic field zero
if the two currents are in the same direction?
At what point on the x-axis is the magnetic field zero
if the two currents are in opposite directions?

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
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The magnetic torque exerted on a flat current carrying loop of
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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 current carrying wire is in the shape of an equilateral
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= 0 plane. The wire carries a current of 2.6 A.
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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...

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(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
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(b) What is the magnitude of the torque if the field is in the
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A long, straight wire carrying 1.5 A of current to the left is
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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 long, straight wire perpendicular to this page carries a
current of 5.15 A directed into the page. Find the magnetic field
at the following points, all 10.5 cm from the wire.
10.5 cm to the left, directly below, to the right, AND directly
above the wire. (magnitude and direction)

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