An electromagnetic wave is transporting energy in the negative y direction. At one point and one instant the magnetic fi

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An electromagnetic wave is transporting energy in the negative ydirection. At one point and one instant the magnetic field is inthe positive x direction. The electric field at that point andinstant is:
A) positive y direction
B) negative y direction
C) positive z direction
D) negative z direction
E) negative x direction
Gauss' law for magnetism, , tells us:
A) the net charge in any given volume
B) that the line integral of a magnetic field around any closedloop must vanish
C) the magnetic field of a current element
D) that magnetic monopoles do not exist
E) charges must be moving to produce magnetic fields