246. It is given that X1, X2, Xm are M non-zero, orthogonal vectors. The dimension of the vector space spanned by the 2M vector X1, X2, XNV XI,?X2,?Xm is
A. 2M
B. M+1
C. M
D. dependent on the choice of XI, X2, Xm

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247. The fl field (in Aim) of a plane wa?c propagating in free space is given by 110 =5,rs cos (wt ? oz) + y ? sin Tlo5(mt --13z-f-Lt2The time average power flow density in Watts isI1
A.100
B.501102
C.50
D.107

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