A) \[6\] and \[15\,\mu F\]
B) \[5\] and \[18\,\mu F\]
C) \[15\] and \[6\,\mu ,F\]
D) \[18\] and \[5\,\mu ,F\]
Correct Answer: A
Solution :
If n identical capacitors each having capacitances C are connected in series with supply voltage V, then equivalent capacitance \[{{C}_{eq}}=\frac{C}{n}\] Here, \[\frac{C}{n}=2.5\mu F\] ...(i) If n identical capacitors are connected in parallel equivalent capacitance \[{{C}_{eq}}=nC\] Here, \[nC=90\mu F\] ...(ii) \[\Rightarrow \] \[n=6\] and \[C=15\mu F\]
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