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Two bars of equal resisttivity rho and r...

Two bars of equal resisttivity `rho` and radil 'r' and '2r' are kept in contact as show. An electric currtn is passed through the bars. Which one of the following is correct ?

A

Heat produced in bar (1) is 2 times the heat peoduced In bar (2)

B

Electric field in both halves is equal

C

Current density across AB is double that across BC.

D

Potential difference across BC is 4 times that across AB.

Text Solution

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The correct Answer is:
D
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Knowledge Check

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

    A
    `V_(AB) =2V_(BC)`
    B
    Power across BC is four times the power across AB
    C
    Current density in AB and BC is equal.
    D
    Electric field due to current inside AB and BC is equal.

  • If Z= - bar(Z) , then which one of the following is correct?

    A
    A. The real part of z is zero
    B
    B. The imaginary part of Z is zero
    C
    C. The real part of Z is equal to imaginary of part
    D
    D. The sum of real and imaginary parts of Z is Z

  • The following bar graph shows the rainfall at selected locations in certain months. Which of the following statements is correct :

    A
    November rainfall exceeds 100 cm in each location
    B
    September rainfall exceeds April rainfall by 50 cm in each location
    C
    November rainfall is lower than April rainfall in each location
    D
    None of the above
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