Question

A coil of 160 turns and area 0.20 m2 is placed with its axis parallel to a magnetic field of initial magnitude 0.40 T (so that the plane of the coil is perpendicular to B). The magnetic field changes uniformly from 0.40 T in the +x direction to 0.40 T in the ‒x direction in 2.0 s. If the resistance of the coil is 16 Ω, at what rate is thermal energy generated in the coil? What is the direction of the induced current? You must draw a figure to define the current direction.

Answer #1

A circular coil of radius 4.0 cm, resistance 0.30 Ω, and 100
turns is placed in a uniform magnetic field at an angle of 30° with
the plane of the coil. The magnitude of the field changes with time
according to ?(?)=20?^(−0.3?) (in Tesla, t is time in seconds).
What is the value of the current induced in the coil at the time t
= 2.0 s?

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 flat circular coil with 96 turns, a radius of 3.72 10-2 m, and
a resistance of 0.432 Ω is exposed to an external magnetic field
that is directed perpendicular to the plane of the coil. The
magnitude of the external magnetic field is changing at a rate of
ΔB/Δt = 0.837 T/s, thereby inducing a current in the coil. Find the
magnitude of the magnetic field at the center of the coil that is
produced by the induced current.

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...

A 5.0-cm-diameter coil has 20 turns and a resistance
of 0.50 Ω. A magnetic field "parallel" to the coil's axis is B =
0.020t + 0.010t2, where B is in tesla and t is in seconds.
a) Find an expression for the induced current I(t) as
a function of time.
b) Evaluate I at t = 10 s and t = 20 s.

A coil 5.00 cm in radius, containing 250 turns, is
placed in a uniform magnetic field that varies with time according
to:
B = (0.230 T/s)t + (4.00 x 10-5
T/s5)t5. The coil is connected to
a 450 ohm resistor, and its plane is perpendicular to the magnetic
field. The resistance of the coil can be
neglected. Find the induced emf in the coil as a
function of time.

Chapter 22, Problem 26 GO
A flat coil of wire has an area A, N turns,
and a resistance R. It is situated in a magnetic field,
such that the normal to the coil is parallel to the magnetic field.
The coil is then rotated through an angle of 90˚, so that the
normal becomes perpendicular to the magnetic field. The coil has an
area of 1.5 × 10-3 m2, 50 turns, and a
resistance of 150 Ω. During the...

2) A square coil with an initial area of 11 m2, is
wrapped once and is placed in the x-y plane a magnetic field in the
-z direction of 0.5 T. The area of the coil is changed in a time of
0.8 seconds. The resistance of the square coil is 9 Ohms, and when
the areas is changed, an induced current of 0.4 amps running
clockwise around the coil. What is the final area of the coil in
m2?

A coil of 12 turns is in the shape of an ellipse having a major
axis of 20.2 cm and a minor axis of 9.82 cm. The coil rotates at 94
rpm in a region in which the Earth's magnetic field is 56.2 μT.
What is the maximum voltage induced in the coil if the axis of
rotation of the coil is along its major axis and this axis of
rotation is aligned perpendicular to the Earth's magnetic field?
What...

#5. A coil 5.00 cm in radius, containing 250
turns, is placed in a uniform magnetic field that varies with time
according to:
B = (0.230 T/s)t + (4.00 x 10-5
T/s5)t5. The coil is connected to
a 450 ohm resistor, and its plane is perpendicular to the magnetic
field. The resistance of the coil can be
neglected. Find the induced emf in the coil as a
function of time. (20 pts.)

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