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(a) -------- 1/4+1/12-----3 ohm..... total resistance---- 7+3ohm----10ohm
(b)----- by ohm's law, I ---v/r= 6/10
(c)------ I=v/r-----6/7
now, v= ir ----- 6/7×7=6v
(ii) 3600 joules
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