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On page 317 of "INTRODUCTION TO ELECTRODYNAMICS" 4th Ed. by Griffiths he states without proof that the analog to Biot-Savart for finding the E field is:

Can anyone direct me to a reference where this is proved or give me a hint how to prove it? Thank you.

Can anyone direct me to a reference where this is proved or give me a hint how to prove it? Thank you.