6 IENVE_Elect and Magn__Electromagnetic Induction_ 2014 vrs02a
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<strong>Elect</strong>romagnetic <strong>Induction</strong><br />
<br />
Exersice. Derive the inductance<br />
of ring solenoid<br />
• Inside<br />
B = <br />
=<br />
<br />
• <strong>Magn</strong>etic flux<br />
F<br />
H<br />
N I<br />
<br />
• Definition of inductance<br />
o<br />
o<br />
= B A<br />
=<br />
L <br />
<br />
o<br />
N I<br />
A<br />
<br />
N F<br />
I<br />
• Substituting F into L we get<br />
inductance of ring solenoid<br />
21.2.<strong>2014</strong> Jarmo Lilja TAMK Fysiikan laitos 18<br />
<br />
L = <br />
D<br />
A<br />
2<br />
N A<br />
<br />
Example. The average diameter<br />
of ring solenoid is 5,0 cm, <strong>and</strong> the<br />
the area of crossection is 4,9<br />
cm 2 , number of turns is 1500 <strong>and</strong><br />
it has an air core<br />
(a) Calculate the inductance of<br />
the ring solenoid<br />
(b) What is the self induced<br />
voltage of the ring solenoid when<br />
the electrical current is<br />
degreasing at the rate of 0,50<br />
kA/s?<br />
o<br />
N
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