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Ampere's Law as written allows us to calculate the magnetic field due to an electric current.
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We also know that a changing electric field produces a magnetic field
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Combine effects of electric current and changing E field on magnetic field to obtain a more complete version of Ampere's Law
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Contribution due to the penetrating current is known a conduction current.
- Contribution due to changing electric field is known as the displacement current
- Final Ampere's Law