NEET Physics Ampere's Law Assertion Reason Question
Assertion (A): In a long straight wire carrying a current, the magnetic field outside the wire decreases with distance from the wire. | Reason (R): According to Ampere's Law, the integral of the magnetic field around a closed loop is proportional to the current enclosed by the loop.
Both A and R are true, and R is the correct explanation of A.
Both A and R are true, but R is not the correct explanation of A.
A is true, but R is false.
A is false.
Correct Answer
Detailed Explanation
Ampere's Law shows that the magnetic field around a long straight wire decreases with distance, as the integral of the magnetic field is proportional to the enclosed current. This explains why the field decreases outside the wire.
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