GA Q8

MCQ2 marks, −0.67

The figure below shows an annular ring with outer and inner as $b$ and $a$ , respectively. The annular space has been painted in the form of blue colour circles touching the outer and inner periphery of annular space. If maximum $n$ number of circles can be painted, then the unpainted area available in annular space is _____.

(A)

$\pi [(b^{2}-a^{2})-\frac{n}{4}(b-a)^{2}]$

(B)

$\pi [(b^{2}-a^{2})-n(b-a)^{2}]$

(C)

$\pi [(b^{2}-a^{2})+\frac{n}{4}(b-a)^{2}]$

(D)

$\pi [(b^{2}-a^{2})+n(b-a)^{2}]$

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