Question
In: Physics
To measure a magnetic field produced by an electromagnet, you use a circular coil of radius...
To measure a magnetic field produced by an electromagnet, you use a circular coil of radius 0.30 m with 25 loops (resistance of 0.30 O) that rests between the poles of the magnet and is connected to an ammeter. While the current in the electromagnet is reduced to zero in 1.5 sec, the ammeter in the coil shows a steady reading of 180 mA. Draw a picture of the experimental setup and determine everything you can about the electromagnet.
Solutions
genius_generous answered 2 years agoRelated Solutions
A circular coil (830 turns, radius = 0.087 m) is rotating in a uniform magnetic field....
A circular coil (830 turns, radius = 0.087 m) is rotating in a
uniform magnetic field. At t = 0 s, the normal to the coil is
perpendicular to the magnetic field. At t = 0.021 s, the normal
makes an angle of 45o with the field because the coil has made
one-eighth of a revolution. An average emf of magnitude 0.075 V is
induced in the coil. Find the magnitude of the magnetic field at
the location of the...
A 123 turn circular coil of radius 2.27 cm is immersed in a uniform magnetic field...
A 123 turn circular coil of radius 2.27 cm is immersed in a
uniform magnetic field that is perpendicular to the plane of the
coil. Over an interval of 0.167 s , the magnetic field strength
increases from 54.5 mT to 94.1 mT . Find the magnitude of the
average emf avg induced in the coil during this time interval, in
millivolts.
A 20-turn circular coil of radius 4.20 cm and resistance 1.00 Ω is placed in a magnetic field directed perpendicular to the plane of the coil.
A 20-turn circular coil of radius 4.20 cm and resistance 1.00 Ω
is placed in a magnetic field directed perpendicular to the plane
of the coil. The magnitude of the magnetic field varies in time
according to the expression B = 0.010 0t + 0.040
0t2, where B is in teslas and t is in seconds. Calculate the induced emf in the coil att = 5.40 s.
A magnetic field is perpendicular to the plane of a single-turn circular coil. The magnitude of...
A magnetic field is perpendicular to the plane of a single-turn
circular coil. The magnitude of the field is changing, so that an
emf of 0.25 V and a current of 2.5 A are induced in the coil. The
wire is then re-formed into a single-turn square coil, which is
used in the same magnetic field (again perpendicular to the plane
of the coil and with a magnitude changing at the same rate). What
(a) emf and (b) current are...
A magnetic field is perpendicular to the plane of a single-turn circular coil. The magnitude of...
A magnetic field is perpendicular to the plane of a single-turn
circular coil. The magnitude of the field is changing, so that an
emf of 0.81 V and a current of 3.8 A are induced in the coil. The
wire is then re-formed into a single-turn square coil, which is
used in the same magnetic field (again perpendicular to the plane
of the coil and with a magnitude changing at the same rate). What
(a) emf and (b) current are...
A circular coil (radius = 0.40 m) has 160 turns and is in a uniform magnetic...
A circular coil (radius = 0.40 m) has 160 turns and is in a
uniform magnetic field. If the orientation of the coil is varied
through all possible positions, the maximum torque on the coil by
magnetic forces is 0.16 Nm when the current in the coil is 4.0 mA.
What is the magnitude of the magnetic field?
0.50 T
1.6 T
0.21 T
1.2 T
0.37 T
Consider an inifinitely long superconducting circular cylinder of radius a in a transverse magnetic field. At...
Consider an inifinitely long superconducting circular cylinder
of radius a in a transverse magnetic field. At large distances from
the cylinder the field is unifrom and of magnitude B0.
Compute the fields inside and outside cylinder using the London
equations and the phenomenological penetration depth lamda. Assume
that the superconducting properties are represented by perfect
diamagnetism and perfect conductivity.
A circular conducting loop with radius 2.70 cm is placed in a uniform magnetic field of...
A circular conducting loop with radius 2.70 cm is placed in a
uniform magnetic field of 0.680 T with the plane of the loop
perpendicular to the magnetic field, as shown. The loop is rotated
180° about the axis in 0.242 s.
1.What is the direction of the induced current flow as the loop
begins to rotate?
2.What is the average induced emf in the loop during this
rotation?
A uniform magnetic field B is directed into the page. A circular circuit of radius r...
A uniform magnetic field B is directed into the page.
A circular circuit of radius r containing a
resistor R and a capacitor C, is placed in this field. Initially
the capacitor is uncharged, and at time t =
0, the magnitude of the magnetic field starts to change at a rate
dB/dt = x, x > 0.
a) Using Lenz’s law, determine the direction of the induced current
in the closed loop. Justify
your answer.
b) Calculate the induced...
A circular wire loop of radius 1.4 cm is placed in a magnetic field of magnitude...
A circular wire loop of radius 1.4 cm is placed in a magnetic
field of magnitude 2.3 T. If the magnetic field goes to zero in a
time of 5 s, what is the magnitude of the current induced in the
loop? The wire has a diameter of 2 mm, and the resistivity of
copper is 1.7 x 10-8 Ohm-m.
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