AIIMS 2018 Physics Electric Field MCQ Question
Assertion : On going away from a point charge or a small electric dipole, electric field decreases at the same rate in both the cases.
Reason : Electric field is directly proportional to square of distance from the charge or an electric dipole.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
In the context of electric fields, a point charge generates an electric field that decreases with the square of the distance (E ∝ 1/r²) due to its monopole nature, whereas an electric dipole, which consists of two equal and opposite charges separated by a distance, produces an electric field that decreases more rapidly as 1/r³. This occurs because the dipole's field results from the vector sum of the fields from both charges, leading to a more rapid decline in intensity with distance. The other options are not applicable as they do not provide relevant information or alternatives regarding the behavior of electric fields from point charges and dipoles. Understanding these differences is crucial for grasping concepts in electrostatics and field theory.
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