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 arm. Recently I learned that circularly polarized light can exert a torque on a quarter-wave plate as the plate converts the beam's angular momentum to linear momentum. In this case I can't determine where the moment arm is. Is it possible that there isn't one?
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