MCQ
The unit of electric permittivity is
- A$Volt/m^2$
- B$Joule/coulomb$
- ✓$Farad/m$
- D$Henry/m$
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${y_1} = 0.05\,\cos \,\left( {0.50\,\pi x - 100\,\pi t} \right)$
${y_2} = 0.05\,\cos \,\left( {0.46\,\pi x - 92\,\pi t} \right)$
then velocity is..... $m/s$

