Question

Two bars of radius r and 2r are kept in contact as shown in figure, an electric current i is passed through bars, which one of the following statement is current

(1) Heat produced in bar BC is 4 time the heat produced in bar AB

(2) Electric field in both bars have the same value

(3) Current density across AB is double that of across BC

(4) Potential difference across AB is 4 time that of across BC

Answer 1

(1) Heat produced in bar BC is 4 time the heat produced in bar AB

As the resistance of Bar BC will be four time of resistance of Bar AB.

For same current heat produced will be four times.