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Charge is distributed non-uniformly on a disc such
\( \mathrm{P} \) that surface charge density is given as \( \sigma=a r \) where

W \( r \) is the distance from the centre of the disc and \( a=18 \mu \mathrm{C} / \mathrm{m}^{3} \). If radius of the disc is \( 75 \mathrm{~cm} \), total charge (in \( \mu \mathrm{C} \) ) on the disc is
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