5.28 A uniform current density given by (A/m?) gives rise to a vector magnetic potential A= -i 4od (x² + y²) (Wb/m). (a) Apply the vector Poisson's equation to confirm the above statement. (b) Use the expression for A to find H. (c) Use the expression for J in conjunction with Ampère's law to find H. Compare your result with that obtained in part (b).

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Electric field

A physical field present around an electrically charged particle that exerts a force on all other charged particles is called an electric field. The charged particles present in the field either repel or attract. From electric charges or time-varying magnetic fields, the electric field originates. One of the manifestations of electromagnetic force which is one of the four fundamental forces present in nature are the electric fields and magnetic fields.