Question

A circular coil of wires (N = 10 turns, R = 3.5 cm) is oriented so that the axis of the coil runs east to west. A compass pointing north sits a distance of d = 12 cm from the center of the coil and lies on the axis of the coil. The horizontal component of the Earth’s magnetic field at this location has a magnitude of 2.5×10−5 T. When a current is turned on the compass needle now points 45◦ west of north. What is the magnitude of the current? When viewed from the compass, does the current go clockwise or counter-clockwise through the coil?

Answer #1

A 175-turn circular loop of radius 45.0 cm is vertical, with its
axis on an east-west line. A current of 200 A circulates clockwise
in the loop when viewed from the east. The Earth's field here is
due north, parallel to the ground, with a strength of 3.00 ✕ 10−5
T. What are the magnitude (in N · m) and direction of the torque on
the loop?

A 50.0 cm ✕ 35.0 cm rectangular coil of 20 turns lies in the
horizontal (x-z) plane with its 50.0 cm side along the
+x axis and its 35.0 cm side along the +z axis.
The coil is in the region of a magnetic field
B = (2.75 ✕ 10−2 T/m ·
s)ztĵ − (3.65 ✕ 10−2
T/m)x.
(a) Determine the magnitude of the induced emf.
mV
(b) What is the direction of the induced emf in the coil as...

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...

A circular coil (d = 28 cm, N = 113 turns) is placed in a region
of space where there is no magnetic field. Suddenly, a magnetic
field is turned on and the coil is totally immersed in it. The
magnetic field reaches the strength of 950 mT in 3.5 ms.
Determine the voltage induced across the coil
Determine the current through a 23 Ω resistor connected across
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 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...

Lab Scenario:
You don't have a current meter in your underequipped lab.
So you make one out of a compass.
The wire you want to measure the current in is aligned with the
North South line.
You place your compass directly under the wire at a distance of
10cm from the wire.
With no current flowing, the compass needle points due
north.
When you turn on the current, the compass needle points 5
degrees west of north.
You now have...

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 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 circular loop of radius R1 lies in the x − y plane, centered
on the origin, and has a current i running through it clockwise
when viewed from the positive z direction. A second loop with
radius R2 sits above the first, centered on the positive z axis and
parallel to the first.
1. If the second loop is centered at the point z = R1, what must
the current be (direction and magnitude) in order for the net...

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