25. (a) The side surface area Afor the drum of diameter Dand length his given by ADhπ=. Thus, ()( )( )( )12225078.85 10C /N m2.3 10 N/C0.12 m0.42 m3.2 10C.qADhEDhσσε−−====×⋅×=×(b) The new charge is ( )( )778.0 cm28 cm
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