Unformatted text preview: ted by L, as the coefficient of the induced
times the change in current.
This is the magnetic analogy to capacitance.
Inductance is a function of geometry as well. NΦB
LI = N Φ B ⇒ L =
I
Physics 2B  Summer Session 2  C. Palmer August 28, 2013 12 This is the magnetic analogy to capacitance.
Inductance is a function of geometry as well.
Objects with significant inductance are called inductors
Symbol SI Units – henry, H V ⋅s
[L] = H = A
Physics 2B  Summer Session 2  C. Palmer NΦB
L=
I
August 28, 2013 13 Find the inductance in a solenoid
N – loops
l – length
A – crosssectional area
I – current NΦB
L=
I
Physics 2B  Summer Session 2  C. Palmer µ0 NI
B=
l
N, l August 28, 2013 14 Find the inductance in a solenoid
N – loops
l – length
A – crosssectional area
I – current NΦB
L=
I
Physics 2B  Summer Session 2  C. Palmer µ0 NI
B=
l
N, l August 28, 2013 15 Find the inductance in a solenoid µ0 NI
Φ B = BA =
A
l – length
l
A – crosssectional area
N – loops I – current NΦB
L=
I
Physics 2B  Summer Session 2  C. Palmer N, l August 28, 2013 16 Find the inductance in a solenoid µ0 NI
Φ B = BA =
A
l – length
l
A – crosssectional area
N – loops I – current µ0 N A
L=
l
2 Physics 2B  Summer Session 2  C. Palmer N, l August 28, 2013 17 Find the inductance in a solenoid µ0 NI
Φ B = BA =
A
l – length
l
A – crosssectional area
N – loops I – current L = µ0 n V
2 Physics 2B  Summer Session 2  C. Palmer N, l August 28, 2013 18 An inductor is placed in a circuit with a battery
that has an EMF, ɛ, and a resistor with a
resistance, R. The inductance, L, of the inductor
depends upon:
A) The amount of current, I, present in the
B)
C)
D)
E) inductor.
The time rate of change of the current in the
inductor.
The EMF, ɛ, of the battery.
The geometry of the inductor.
The resistance of the resistor, R.
Physics 2B  Summer Session 2  C. Palmer August 28, 2013 19 An inductor is placed in a circuit with a battery
that has an EMF, ɛ, and a resistor with a
resistance, R. The inductance, L, of the inductor
depends upon:
A) The amount of current, I, present in the
B)
C)
D)
E) inductor.
The time rate of change of the current in the
inductor.
The EMF, ɛ, of the battery.
The geometry of the inductor.
The resistance of the resistor, R.
Physics 2B  Summer Session 2  C. Palmer August 28, 2013 20 Now we analyze the simple circuit with a resistor, R, and inductor, L, in series with a battery. Kirchhoff ’s loop rule Physics 2B  Summer Session 2  C. Palmer August 28, 2013 21 N...
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 Summer '10
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