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2 Retarded Potentials of a Magnetic Dipole Moment
Consider a loop wire of radius a. At t = 0, a constant current I is suddenly
turned on. For any point under consideration, r > a.
So, t<0,
I(t) =
I, t20.
(2)
a. Determine the vector potential A(r, 0)!
b. Determine the electric field E(r,0)!
c. Determine the magnetic field B(r, 0)!
Figure 1: Magnetic dipole moment

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