As shown in the figure, a circuit has the current I in the presence of magnetic field. (1) Find the magnetic force applied to each segment of this wire separately. (2) Find the total magnetic force. (3) Define direction and magnitude of dipole magnetic moment ?⃗ μ→.

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As shown in the figure, a circuit has the current I in the presence of magnetic field.

(1) Find the magnetic force applied to each segment of this wire separately.

(2) Find the total magnetic force.

(3) Define direction and magnitude of dipole magnetic moment ?⃗ μ→.

(4) How much work must be realized by an external magnetic force to rotate the circuit to the position which the angle of ?⃗ μ→ and ?⃗ B→  will be 180∘180∘.

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