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Question A7
A wire ring of radius a, is placed in an external uniform magnetic field as shown in figure 4
B = B₂+ B₂
where B < 0 and By < 0, and carrying a clock-wise current I.
a) Apply the right-hand rule and find the direction of the magnetic moment vector, .
b) Derive an expression for the magnitude of the torque on the loop.
X
Figure 4: A wire ring in an external magnetic field
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