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Which of the following statements is/are correct?
  • a)
    If the electric field due to a point charge varies as r-25 instead of r-2, then Gauss law will still be valid.
  • b)
    Gauss law can be used to calculate the field distribution around an electric dipole.
  • c)
    If the electric field between two point charges is zero somewhere, then the signs of the two charges are the same.
  • d)
    The work done by the external force in moving a unit positive charge from point A at potential VA to point B at potential VB is (VB - VA).
Correct answer is option 'C,D'. Can you explain this answer?
Most Upvoted Answer
Which of the following statements is/are correct?a)If the electric fi...
a) If the electric field due to a point charge varies as r-25 instead of r-2, then Gauss law will still be valid.
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Community Answer
Which of the following statements is/are correct?a)If the electric fi...
If field due to a point charge varies are r-25, then E = cr-25; where c is a constant.
Using Gauss's law, we have
Hence, Gauss law is invalid and option 1 is wrong.
Electric field due to a dipole is not symmetric; hence, a Gaussian surface cannot be used to find the electric field due to a dipole using
Gauss law. Hence, option 2 is wrong.
Electric field on the line joining the charges is opposite in direction if they are of the same sign only. Hence, option 3 is correct.
By definition of potential, work done by external force to move a unit positive charge from point A to point B is given by:
W = q(VB -VA) = VB - VA
Hence, option 4 is correct.
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Which of the following statements is/are correct?a)If the electric field due to a point charge varies as r-25 instead of r-2, then Gauss law will still be valid.b)Gauss law can be used to calculate the field distribution around an electric dipole.c)If the electric field between two point charges is zero somewhere, then the signs of the two charges are the same.d)The work done by the external force in moving a unit positive charge from point A at potential VA to point B at potential VB is (VB - VA).Correct answer is option 'C,D'. Can you explain this answer?
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