Look at the drawing given in Fig. which has been drawn with ink of uniform line thickness. The m...

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Look at the drawing given in Fig. which has been drawn with ink of uniform line thickness. The mass. of ink used to draw each of the two inner circles and each of the two line segments is \( m \). The mass of ink used to draw the outer circle is \( 6 \mathrm{~m} \). The coordinates of the centres of the different parts are : outer circle \( (0,0) \), left inner circle \( (-a, a) \), right of inner circle \( (a, a) \), vertical line \( (0,0) \) and the horizontal line \( (0,-a) \). The \( Y \)-coordinate of the \( \mathrm{CM} \) of the ink in this drawing is :
(A) \( a / 10 \)
(B) \( a / 8 \)
(C) \( a / 12 \)
(D) \( a / 3 \)
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