Question

**Shrinking Loop.** A circular loop of flexible
iron wire has an initial circumference of 170 cmcm , but its
circumference is decreasing at a constant rate of 14.0 cm/scm/s due
to a tangential pull on the wire. The loop is in a constant uniform
magnetic field of magnitude 0.800 TT , which is oriented
perpendicular to the plane of the loop. Assume that you are facing
the loop and that the magnetic field points into the loop

A. Find the magnitude of the emf EEEMF induced in the loop after exactly time 1.00 ss has passed since the circumference of the loop started to decrease.

B. Find the direction of the induced current in the loop as viewed looking along the direction of the magnetic field.

Answer #1

Shrinking Loop. A circular loop of flexible iron wire has an
initial circumference of 168 cm , but its circumference is
decreasing at a constant rate of 10.0 cm/s due to a tangential pull
on the wire. The loop is in a constant uniform magnetic field of
magnitude 1.00 T , which is oriented perpendicular to the plane of
the loop. Assume that you are facing the loop and that the magnetic
field points into the loop. Find the magnitude...

A circular wire loop of radius rr = 16 cmcm is immersed in a
uniform magnetic field BB = 0.375 TT with its plane normal to the
direction of the field.
If the field magnitude then decreases at a constant rate of
−1.2×10−2 T/sT/s , at what rate should rr increase so
that the induced emf within the loop is zero?

A circular loop of wire with area 0.020 m2m2 lies in the
x-y plane. Initially there's a magnetic field of 3.6 TT in
the -z-direction. The field remains constant for 11 ss ,
then decreases gradually to zero in 11 ss , and then remains zero
for 11 ss .
Part A: Find the magnitude of the induced emf in the loop for
the first 11 ss interval.
Express your answer to two significant figures and include the
appropriate units....

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?

Question 1: A 13.7 cm diameter loop of wire is initially
oriented perpendicular to a 1.9 T magnetic field. The loop is
rotated so that its plane is parallel to the field direction in
0.33 s .
Part A: What is the average induced emf in the loop?
Question 2: A 7.4 cm diameter circular loop of wire is in a 0.71
T magnetic field. The loop is removed from the field in 0.28 s .
Assume that the loop...

A 26.8 cm-diameter loop of wire is initially oriented
perpendicular to a 1.6 T magnetic field. The loop is rotated so
that its plane is parallel to the field direction in 0.22 s .
What is the magnitude of the average induced emf in the
loop?
Express your answer using two significant figures.
Eavg=
V

The magnetic field perpendicular to a circular wire loop 8.0cm
in diameter is changed from 0.70T toward the observer to 0.34T away
from you in 160 milliSeconds.
Q1. Calculate the magnitude of the induced EMF (during the
change in B ) and determine what direction will the induced current
flow during the change in B? Will it be CW or CCW as
you see it?
a) The initial Flux is:
b) The final Flux is:
c) The induced EMF is:...

A time-varying magnetic field is perpendicular to the plane of a
circular loop of diameter 10 cm made with wire of diameter 3.4 mm
and resistivity 2.07 × 10-8?·m.
The magnetic field increases as a function of time, with magnitude
B = (0.79 t) T/s
a) What is the magnitude of the emf induced in the loop?
b) What is the value of the current through the loop?
c) At what rate does energy appear as thermal energy in the...

A circular loop of wire of radius R lies in the
xy-plane, where a time-varying, radially symmetric
magnetic field of magnitude B = k r
t3 (in SI units) points in the
positive z-direction. Here, t is time, r
is the distance from the centre of the loop, and k is a
positive constant.
(i) What must be the SI units of k ?
(ii) Calculate the magnetic flux Φm through the loop
as a function of time t. ...

A circular loop of wire with an area of .1m^2 is placed in a 2T
magnetic field. The field increases at a rate of 0.2 T/S. What is
the induced emf in the loop? What is the direction of the induced
current in the loop?

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