Suppose that an electric charge moves in a magnetic field in a plane perpendicular to the lines of induction. Prove that the orbital magnetic moment of the circulating charge is directed against the field.

Suppose that an electric charge moves in a magnetic field in a plane p

1.	Suppose that an electric charge moves in a magnetic field in a plane perpendicular to the lines of induction. Prove that the orbital magnetic moment of the circulating charge is directed against the field.
Answer» Solution :The positive CHARGE circulates as shown in FIG. 28.18a, The direction of the magnetic moment 18 established with the aid of the screw driver rule (seg 40.5, 40.6). The direction of circulation of a . negative charge is the OPPOSITE (Fig. 28.15b), but the magnetic moment is, just the same, directed against the field.

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Suppose that an electric charge moves in a magnetic field in a plane perpendicular to the lines of induction. Prove that the orbital magnetic moment of the circulating charge is directed against the field.

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