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A plane electromagnetic waves travels in a medium of relative permeability 1.61 and relative permittivity 6.44. If magnitude of magnetic intensity is 4.5 × 10 –2 Am –1 at a point, what will be the approximate magnitude of electric field intensity at that point? (Given : Permeability of free space μ 0 = 4 π × 10 –7 NA –2 , speed of light in vacuum c = 3 × 10 8 ms –1 )

1. 16.96 Vm –1
2. 2.25 × 10 –2 Vm –1
3. 8.48 Vm –1
4. 6.75 × 106 Vm –1

Correct answer: 8.48 Vm –1

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