ch23_p23 - 23. (a) The side surface area A for the drum of...

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A Dh π = . Thus () 2 12 5 0 2 7 C 8.85 10 2.3 10 N/C 0.12 m 0.42 m Nm 3.2 10 C. qA D h E D h σσ ε §· == π = π = π × × ¨¸ ©¹ (b) The new charge is ( ) 77 8.0 cm 28 cm 3.2 10 C 1.4 10 C. 12 cm 42 cm AD h qq q h −− ªº ′′ π § · = × = × «»
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