for PH 113 (Moloney)
•
Inductance is defined as
Inductance = (flux of magnetic field)/current
•
Self inductance = L = (flux of magnetic field in circuit 1)/(current in circuit 1)
•
Mutual inductance = M21= (flux of magnetic field in circuit 2)/(current in circuit
1)
•
or by Mutual inductance = M12 = (flux of magnetic field in circuit 1)/(current in
circuit 2)
•
It is true that M12 = M21
•
Examples
o
The units of inductance are henries.
Express henrys in terms of tesla.
o
A solenoid has 200 turns and is 0.50 m long. Its radius is 0.10 m, its current is
2.0 A.
Calculate the magnetic field inside the solenoid on its axis
. (The
formula is B = u_o n I.)
Calculate the total magnetic flux in the solenoid
, including units.
Calculate the inductance of this solenoid, in henries
.
o
If this same solenoid were carrying a current of 3.0 A, the inductance would
be
the same
1.5 times greater
1.5 times smaller
none of the above
o
Here we have calculated the
a) selfinductance b) mutual inductance
(say
which it is)
o
This solenoid is surrounded by a thin coil of radius 0.15 m, and 100 turns
Calculate the magnetic flux in the thin coil, due to the current in the
solenoid (2A)
Calculate the inductance which exists between the solenoid and the
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 Spring '08
 Turner
 Physics, Current, Inductance, Work, Magnetic Field, Inductor, Faraday's law of induction, henries

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