Arbetsblad
Arbetsblad
Arbetsblad
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Lösning:<br />
F<br />
a<br />
2<br />
−7<br />
B<br />
F 0,<br />
5 ⋅ 2 ⋅ 4π<br />
⋅10<br />
= ⇒ B = 2µ<br />
0 =<br />
= 0,<br />
22 T<br />
2µ<br />
a<br />
−6<br />
0<br />
27 ⋅10<br />
−6 −6<br />
Φ = B ⋅ a = 0, 22 ⋅ 27 ⋅ 10 = 5, 8 ⋅10<br />
Wb<br />
−3<br />
( 12 + 12 + 20 + 20)<br />
⋅10<br />
5<br />
R mJärn =<br />
= 9,<br />
4 ⋅10<br />
A / Wb<br />
−7 −6<br />
4 ⋅ π ⋅10 ⋅ 2000 ⋅ 27 ⋅10<br />
(får försummas)<br />
−3<br />
1⋅10<br />
7<br />
R mgap =<br />
= 2,<br />
9 ⋅10<br />
A / Wb<br />
−7 −6<br />
4 ⋅ π ⋅10 ⋅ 27 ⋅10<br />
Rm = Rmgap + RmJärn = 3⋅10 7 A / Wb<br />
Ohms lag för den magnetiska kretsen:<br />
-6 -7<br />
Fm<br />
= Φ ⋅ Rm<br />
= 5,8⋅10 ⋅3⋅10 = 177 At<br />
11