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Is it possible to apply a torque without a moment arm?
In some statics problems, the question may say something like "a torque is applied about Point B". I've always assumed this was a simplification and the torque was created using a force and a moment ...
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Torque on a quarter-wave plate… Where is the force? Where is the moment arm?
If you shine circularly polarized light (carrying angular momentum) through a quarter-wave plate, the light will emerge as linearly polarized light (carrying no angular momentum) from the other side. ...