複選題
24. A magnetic dipole made of a conductive ring carrying a current I. Observ- ing from far away； which of the following statements are FALSE?
(A) If the magnetic dipole is placed in a uniform magnetic feld, it experiences no net magnetic force.
(B) The magnetic dipole experiences a net torque if its dipole moment is parallel to the uniform magnetic feld.
(C)The magnetic dipole may experience a net force induced by another magnetic dipole.
(D) The magnetic field induced by the magnetic dipole is approximately proportional to the area of the ring.
(E) The magnetic field induced by the dipole is approximately inversely proportional to the square of the distance from it.

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統計： A(0), B(2), C(1), D(2), E(1) #2740302

詳解 (共 1 筆)

#7431003
所以這題只要記住三個東西就是
在均勻磁場中，磁偶極可能會受力矩轉動
磁偶極在磁場中的力矩為
6a4a0e3072592.jpg
而如果磁偶極矩和磁場平行
cita=0
所以力矩也會等於0
所以平行時沒有力矩
磁偶極造成的磁場通常不是均勻磁場
而是會隨位置變化的磁場
在非均勻磁場中，磁偶極可能會受到淨力
然後磁偶極產生的磁場和面積的關係公式為
6a4a0f4d3ed8e.jpg
然後e選項指的是磁偶極產生磁場會和距離平方成反比
這是錯的
是點電荷
而我們要求的是磁偶極遠方磁場
會正比於1/距離^3
ㅤㅤ
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