Question

The component of the external magnetic field along the central axis of a 49 turn circular coil of radius 41.0 cm decreases from 1.90 T to 0.700 T in 3.40 s. If the resistance of the coil is R = 7.50 Ω, what is the magnitude of the induced current in the coil?

magnitude:__________ A

What is the direction of the current if the axial component of the field points away from the viewer?

Answer #1

The component of the external magnetic field along the central
axis of a 125-turn circular coil of radius 34.0 cm decreases from
2.40 T to 0.600 T in 1.60 s. If the resistance of the coil is 1.50
Ω, what is the magnitude of the induced current in the coil?

A 29-turn circular coil of radius 3.40 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 at
t = 4.60 s.

A 37-turn circular coil of
radius 4.60 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
at t = 4.20 s.

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 0.23 V and a current of 2.4 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 loop with 50 coils is pulled (to the right) from an
external magnetic field of 0.8 T into the page. At t=0 the right
edge of the loop is at the right edge of the magnetic field. After
0.250 seconds the loop has moved completely out of the magnetic
field. Diameter of the coil is 10 cm
Find the rate of change in flux through one loop as the loop if
the loop is pulled out of the...

9. 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 0.77 V and a current of 2.7 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 emf is induced in the...

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 circular loop in the plane of the paper lies in a 0.75 T
magnetic field pointing into the paper. The loop’s diameter is
changed from 20.0 cm to 6.0 cm in 0.50 s.
Determine the direction of the induced current and justify your
answer.
Determine the magnitude of the average induced emf.
If the coil resistance is 2.5 Ω, what is the average induced
current?

The induced magnetic field at radial distance 6.0 mm from the
central axis of a circular parallel-plate capacitor 1.7 × 10-6 T.
The plates have radius 3.8 mm. At what rate is the magnitude of the
electric field between the plates changing?

A circular loop in the plane of a paper lies in a 0.75 TT
magnetic field pointing into the paper. The loop's diameter changes
from 20.5 cmcm to 6.4 cmcm in 0.46 ss .
What is the magnitude of the average induced emf?
What is the average induced current if the coil resistance is
4.3 Ω?

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