Torque
Net force versus torque

When the net force on the system is zero, the torque measured from any point in space is the same. For example, the torque on a current-carrying loop in a uniform magnetic field is the same regardless of the point of reference. If the net force F {\displaystyle \mathbf {F} } is not zero, and τ 1 {\displaystyle {\boldsymbol {\tau }}_{1}} is the torque measured from r 1 {\displaystyle \mathbf {r} _{1}}, then the torque measured from r 2 {\displaystyle \mathbf {r} _{2}} is τ 2 = τ 1 + (r 2 − r 1) × F {\displaystyle {\boldsymbol {\tau }}_{2}={\boldsymbol {\tau }}_{1}+(\mathbf {r} _{2}-\mathbf {r} _{1})\times \mathbf {F} }
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