Two wires of same material having length is in ratio 1:2 and diameter in 2:3 are connected in series .compute the ratio of potential diffrence
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current is same for both cases as they are in series.then aplly ohm's law i.e. V=IR where R=(density*length)/area. also a is directly proportional to the square of diameter. Now the eqn becomes V~d*2*l now get the two eqn and have the ratios of them and you will get 9:8 ans.hope you will get it.
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