P28_011 - 11. From Va E1 = Vc ir1 iR and i = (E1 E2 )/(R +...

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11. From V a −E 1 = V c ir 1 iR and i =( E 1 2 ) / ( R + r 1 + r 2 ), we get V a V c = E 1 i ( r 1 + R ) = E 1 µ E 1 2 R + r 1 + r 2 ( r 1 + R ) =4 . 4V µ 4 . 2 . 1V 5 . 5Ω+1 . 8Ω+2
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