Question

Horizontal electric power lines supported by vertical poles can carry large currents. Assume that Earth’s magnetic field runs parallel to the surface of the ground from south to north with a magnitude of 0.50×10−4 T and that the supporting poles are 38 m apart.

Find the magnitude and direction of the force that Earth’s
magnetic field exerts on a 38 m segment of wire carrying 95 A if
the current runs toward the northeast making an angle of 30∘∘ north
of east. *(Express your answer to two significant
figures.)*

Answer #1

Two long wires parallel to the page carry currents. Wire 1 =
1.5A and wire 2 = 1.1A and they are 1.8cm apart. Point P is 2.3 cm
to the right of wire 2. What is the magnitude and direction of the
magnetic field at P? A compass is placed at P, in which direction
does the north needle point?

Two long, parallel transmission lines, 42.0 cm apart, carry
24.0-A and 75.0-A currents.
A.) Find all locations where the net magnetic field of the two
wires is zero if these currents are in the same direction. Give
answer in cm. (Note: Assume that the positive x axis is
directed from the 75.0-A wire to the 24.0-A wire perpendicular to
the wires, with the origin on the 75.0-A wire)
B.) Find all locations where the net magnetic field of the two...

Which of the following statements is correct?
Question 1 options:
Magnetic field lines come out of the magnetic south pole of the
magnet and enter at the north pole of the magnet.
Like poles of magnets attract each other and unlike poles
repel.
The north pole of a magnet points toward the Earth's geographic
north pole.
If you cut a bar magnet in half, you get one piece with just a
north magnetic pole on it and the second piece...

At a point on the Earth’s surface the magnetic field has a
horizontal component due north of 1.8 ́ 10-5 T and a vertical
component downwards of 5.5 ́ 10-5 T.
(i) Draw a diagram.
(ii) Calculate the force on a 1.5 m length of wire carrying a
current of 13 A when the wire is held vertically with the current
flowing downwards.
(iii) Calculate the force when the wire is horizontal with the
current flowing west to east.

Two long parallel wires which are 0.03 m apart carry equal
currents of 2.5 A. a) Calculate the net magnetic field at a point
midway between the two wires if their currents flow in the same
direction. Give magnitude and direction of Bnet. b) Calculate the
net magnetic field at a point midway between the two wires if the
currents flow in opposite direction. Give magnitude and direction
of Bnet. c) Calculate the magnitude of the magnetic force per meter...

Two long, parallel conductors separated by 14.0 cm carry
currents in the same direction. The first wire carries a current
I1 = 5.50 A, and the second carries
I2 = 8.00 A. (Assume the conductors lie in the
plane of the page.)
(a) What is the magnitude of the magnetic field created by
I1 at the location of
I2?
T
(b) What is the force per unit length exerted by
I1 on I2?
magnitude
N/m
direction
---Select--- towards wire 1...

1. The strength of an electromagnet can be increased by
A. Decreasing the number of coils of wire
B.Adding a core of iron to the coil of wire
C.Decreasing the current in the wire
D.All of these
2. Auroras are caused by
A.the van Allen Radiation belts trapping harmful charged
particles from space in the Earth’s magnetic field and producing
dancing lights.
B.Disturbances in the Earth’s magnetic field, near the poles,
which allow charged particles from space to dip into...

If two wires carry current next to each other, they will exert a
force on each other. The force is caused by magnetic fields. One
current creates a magnetic field, and this field exerts a force on
the other current. The magnitude of the field created by a long,
straight current-carrying wire is given by Equation 1 below;
B= (μ0i)/(2πr)
where i is the current and r is the distance from the wire. The
magnitude of the force exerted on...

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