If the potential of the inner shell is $10\,V$ and that of the outer shell is $5\,V$, then potential at the centre will be....$V$
A$10$
B$5$
C$15$
D$0$
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A$10$
a ${{\rm{V}}_{{\rm{in}}}} = \frac{{{\rm{k}}{{\rm{Q}}_1}}}{{\rm{a}}} + \frac{{{\rm{k}}{{\rm{Q}}_2}}}{{2{\rm{a}}}} = 10\,{\rm{V}}$ (this will be constant for region from center to inner sphere surface)
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