query: How does permanent magnets attract each other if the $B$-field can do no work?
positive_passages.docid: 3386
positive_passages.text: How can magnets be used to pick up pieces of metal when the force from a magnetic field does no work?
negative_passages.docid: 106630
negative_passages.text: Permanent Magnet Lines & Currents:
negative_passages.docid: 149353
negative_passages.text: Feynman diagram for attractive forces
negative_passages.docid: 10296
negative_passages.text: Why doesn't the magnetic field polarize when polarizing light?
negative_passages.docid: 39132
negative_passages.text: Why is there a magnetic field around a magnet if there are no charges moving?
negative_passages.docid: 30286
negative_passages.text: Perfect conductor and magnetic field
negative_passages.docid: 136401
negative_passages.text: Violation of energy conservation in retarded interaction of magnet and coil
negative_passages.docid: 127140
negative_passages.text: Why does magnet attract iron but not other metals?
negative_passages.docid: 128759
negative_passages.text: Why don't we define potential due to a magnetic field?
negative_passages.docid: 153346
negative_passages.text: Do magnets lose their magnetism?
negative_passages.docid: 43505
negative_passages.text: Why is there no gravitational magnetic field? (Or, is there?)
negative_passages.docid: 155927
negative_passages.text: Force felt by a moving charge due to its own magnetic field?
negative_passages.docid: 92603
negative_passages.text: Force of moving magnetic field on stationary charge
negative_passages.docid: 89355
negative_passages.text: Why does Earth behave like Natural Bar Magnet?
negative_passages.docid: 101318
negative_passages.text: Why does a monopole not radiate energy in electodynamics?
negative_passages.docid: 338
negative_passages.text: How do moving charges produce magnetic fields?
negative_passages.docid: 29077
negative_passages.text: current in wire + special relativity = magnetism