54. A region shown below contains a perfect conducting half-space and air. The surface current \(\overrightarrow {K_s}\)  on the surface of the perfect conductor is s \(\overrightarrow {K_s}=\widehat x2\) amperes per meter. The tangential  \(\overrightarrow H\) 
 field in the air just above the perfect conductor is

 

(A) \((\widehat x+\widehat z)2\) amperes per meter

(B) \(\widehat x2\) amperes per meter

(C) \(-\widehat z 2\) amperes per meter

(D) \(\widehat z2\) amperes per meter

Hint: 

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