Time varying field - Static solution multiplying factor

Q.  In solution evaluation process of inhomogeneous vector potential wave equation, if points are completely removed from the source, then by which factor does the time varying field & static solution differ?
- Published on 01 Oct 15

a. e-jkr
b. ejkr
c. e-jk/r
d. e(jk + r)

ANSWER: e-jkr

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