21.14. Set Up:
The field of the induced current is directed to oppose the change in flux in coil
B.
When
S
is closed
the magnetic field of coil
A
is directed to the right. The field of
A
is stronger at points closer to
A.
The field of
A
is
proportional to the current in
A.
Solve: (a)
The flux due to field directed to the right decreases (goes to zero) when
S
is opened. The field due to the
induced current is to the right inside of coil
B.
To produce field in this direction, the induced current passes through
the resistor from
a
to
b.
(b)
The flux through coil
B
due to the field of
A
increases, so the field due to the induced current is to the left inside
of coil
B.
To produce field in this direction, the induced current passes through the resistor from
b
to
a.
(c)
Decreasing
R
causes the current in coil
A
to increase, so the field of
A
increases. The flux through coil
B
due to the
field of
A
increases, so the field due to the induced current is to the left inside of coil
B.
To produce field in this direc
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This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.
 Spring '07
 Shoberg
 Current

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