Two bars of radius ' r ' and ' 2 r ' are kept in contact as shown. An electric current I is passed through the bars. Which one of the following is correct?

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TestHub · Accepted Answer

Current flowing through both the bars is equal. Now, the heat produced is given by H ​ = I 2 Rt or H ∝ R or H BC ​ H A B ​ ​ = R BC ​ R A B ​ ​ = ( r 1 ​ ) 2 ( 2 r 1 ​ ) 2 ​ = 4 1 ​ or H BC ​ = 4 H A B ​ ​ ( as R ∝ A 1 ​ ∝ r 2 1 ​ )

Physics - Current Electricity Question with Solution | TestHub

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