Complete the description of how the two auxiliary fields parallel one another.
In a dielectric the displacement field hides the ______ charge so that Gauss’s law counts only free charge. In a magnetic material the ______ field plays the same role, hiding the bound ______ so that Ampère’s law counts only free ______.
Word bank: bound · auxiliary H · currents · current · polarisation
Hints
- Each auxiliary field exists to remove the bound sources from its law.
- In magnetism the bound sources are circulating currents, not charges.
Show the answer
In a dielectric the displacement field hides the bound charge so that Gauss’s law counts only free charge. In a magnetic material the auxiliary H field plays the same role, hiding the bound currents so that Ampère’s law counts only free current.
removes bound charge from Gauss’s law and removes bound current from Ampère’s law. Both are bookkeeping devices, and in both cases the force is still exerted by the original field.
Practise Magnetic Materials
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