Electromagnetic Field Theory
A plane wave magnetic field is represented by Bx = cos(y – ct). The electric and magnetic fields will be zero in the direction

 Ex = Ey = 0, Bx = By = 0.
 Ex = Ey = 0, By = Bz = 0.
 None of these.
 Ey = Ez = 0, By = Bz = 0.

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Electromagnetic Field Theory
Inside a hollow conducting sphere

 electric field is zero.
 electric field changes with distance from the center of the sphere.
 electric field is a non zero constant.
 electric field changes with magnitude of the charge given to the conductor.

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