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For a current loop in a B-field, while the net force is zero, the torque is not zero. But, under what condition is the torque weakest?

For a current loop in a B-field, while the net force is zero, the torque is not zero. But, under what condition is the torque weakest?
'B'
I
I
a
B
B
O A. Rotate 90 degrees about the vertical axis shown
O B. Rotate 90 degrees about the horizontal axis shown
O C. It's always constant
O D. Rotate 45 degrees about the vertical axis shown
O E. Rotate 45 degrees about the horizontal axis shown

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