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Current Electricity

Question

The speed of electromagnetic waves in a medium of dielectric constant 2.25 and relative permeability 4 is
$1 . 10^{8} m / s$
25 × 10⁸ m/s
2 × 10⁸ m/s
3 × 10⁸ m/s
3 × 10⁸ m/s

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Solution

1 . 10^{8} m / s