MCQ
The average value of electric energy density in an electromagnetic wave is :
- A$\frac{1}{2}\varepsilon_0E^2$
- B$\frac{E^2}{2 \varepsilon_0}$
- C$\varepsilon_0E^2$
- ✓$\frac{1}{4}\varepsilon_0E^2$
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$(i)$ acceleration of the centre of mass of ring is $\frac{g}{3}$
$(ii)$ acceleration of the hanging particle is $\frac{2g}{3}$
$(iii)$ frictional force (on the ring) acts along forward direction
$(iv)$ frictional force (on the ring) acts along backward direction

