A) \[\frac{\sigma }{{{\varepsilon }_{0}}}\]
B) \[\frac{\sigma }{{{\varepsilon }_{0}}}\,(R-r)\]
C) \[\frac{\sigma }{{{\varepsilon }_{0}}}\,(R+r)\]
D) None of these
Correct Answer: C
Solution :
Let Q and q be the charges on the spheres. The potential at the common centre will be \[=0\] \[\therefore \,\,|\xi |\,=\,\left| \frac{-\Delta \phi }{\Delta t} \right|=\,\left| -\left( \frac{0-BA}{\frac{T}{4}-0} \right) \right|=\frac{4BA}{T}\] But \[(\Delta \phi ={{\phi }_{2}}-{{\phi }_{1}})\] \[T=\frac{2\pi }{\omega }\] \[\Rightarrow \]
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