The impulse and torque on a capacitor when a uniform B-field is turned off depend on the source of that field, so the classic textbook problem is ill-posed unless the source is specified.
The issues raised in this pa- per regarding the exercise above are not extraordinary - they are typical of the understanding of physicists and physics students
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Not All Uniform B-Fields Are The Same!
The impulse and torque on a capacitor when a uniform B-field is turned off depend on the source of that field, so the classic textbook problem is ill-posed unless the source is specified.