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(a) On what factors does the speed of an electromagnetic wave in a medium depend ? (b) How is an electromagnetic wave produced ? (c) Sketch a schematic diagram depicting the electric and magnetic fields for an electromagnetic wave propagating along z-axis.
The electric field in an electromagnetic wave in vacuum is given by : E⃗ = (6·3 N/C) [cos (1·5 rad/m) y + (4·5 × 10⁸ rad/s) t] î
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