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

a)

Heat produced in bar  is 4 times the heat produced in bar

b)

Electric field in both halves is equal

c)

Current density across  is doubled that of across

d)

Potential difference across  is 4 times that of across



Question ID - 150975 | SaraNextGen Top Answer

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

a)

Heat produced in bar  is 4 times the heat produced in bar

b)

Electric field in both halves is equal

c)

Current density across  is doubled that of across

d)

Potential difference across  is 4 times that of across

1 Answer
127 votes
Answer Key / Explanation : (a) -

(a)

Current flowing through both the bars is equal. Now, the heat produced is given by

or

or

127 votes


127