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Question

An electromagnetic wave has an electric field given by the expression (in Cartesian co-ordinates) : E(x,t)=6.0 cos(1.4×107x3.43×1015t)^z. What is the direction of the magnetic field at time t = 0 and position x = 0 ?
  1. -x
  2. +x
  3. +y
  4. -y


Solution

The correct option is D -y
E×B || V 
where V represents the direction of propogation.
Given that wave is propagating along + x-axis and E along z-axis.
Hence E×B=+^i
^k×B=+^iB is along^j

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