Question:medium

Which of the following statements are correct regarding the electric and magnetic fields at any surface of discontinuity ?
• [A.] The tangential component of \(E\) is continuous at the surface
• [B.] The tangential component of \(H\) is continuous across a surface except at the surface of a perfect conductor
• [C.] The tangential component of \(B\) is continuous at the surface of discontinuity
• [D.] The normal component of \(D\) is continuous if there is no surface charge density Choose the correct answer from the options given below :

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Important electromagnetic boundary conditions:
• Tangential \(E\) is continuous
• Normal \(B\) is continuous
• Normal \(D\) changes with surface charge density
• Tangential \(H\) changes with surface current density

Updated On: May 22, 2026

A, B, D only
A, B, C only
B, C, D only
A, C, D only

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The Correct Option is A

Solution and Explanation

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Top Questions on communication systems

The percentage of the total power carried by the sidebands of the AM wave for tone modulation when the modulation index is 0.3 is:
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Match List-I with List-II:

List-I (Modulation Schemes)	List-II (Wave Expressions)
(A) Amplitude Modulation	(I) \( x(t) = A\cos(\omega_c t + k m(t)) \)
(B) Phase Modulation	(II) \( x(t) = A\cos(\omega_c t + k \int m(t)dt) \)
(C) Frequency Modulation	(III) \( x(t) = A + m(t)\cos(\omega_c t) \)
(D) DSB-SC Modulation	(IV) \( x(t) = m(t)\cos(\omega_c t) \)

Choose the correct answer: