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1. For dielectric to dielectric interface with surface charge density, which of the following statements are true? Dn2 - Dn1 = r sEt1 = Et2En1 = En2
(A): 1, 2 and 3
(B): 1, 2 and 4
(C): 1, 2 only
(D): 1, 4 only
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