When a current-carrying loop is placed in a magnetic field, the loop tends to rotate such that its normal becomes aligned with the magnetic field.
https://www.powershow.com/view4/748ebe-ZGFmY/When_a_current-carrying_loop_is_placed_in_a_magnetic_field_the_loop_tends_to_rotate_such_that_its_normal_becomes_aligned_with_the_magnetic_field_powerpoint_ppt_presentation
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