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(1)安培右手定則:<br />
(a) 電流長直導線<br />
<strong>Chap.16</strong> <strong>磁源</strong><br />
(圖 16-1) (圖 16-2)<br />
(b) 螺管線圈<br />
(圖 16-3) (圖 16-4)<br />
(2)比歐-沙瓦定律(Biao-Savart’s law):<br />
μ ˆ<br />
0 Idl×<br />
r<br />
dB<br />
=<br />
2<br />
4π<br />
r<br />
......( Idl 為一小直線段形的電流導線素)<br />
−7<br />
式中 μ0= 4π × 10 T⋅ m/ A為自由空間的磁導率<br />
(permeability)<br />
(3)安培定律(Ampere’s law):<br />
∫<br />
Β dl( I)<br />
0 μ ⋅ = ∑<br />
式中( ∑ I )為穿越積分迴路所圍面積的淨電流量。<br />
- 1 -<br />
(圖 16-5)<br />
CH16 <strong>磁源</strong>
東海大學物理系<br />
- 2 -
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