NEET Physics Magnetic Force on Current Assertion Reason Question
Assertion (A): The magnetic force on a current-carrying rod is zero if the external magnetic field is parallel to the current direction.
Reason (R): The magnetic force acts perpendicular to both the current direction and the magnetic field.
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 but R is true.
Correct Answer
Detailed Explanation
The magnetic force is zero when the magnetic field is parallel to the current because the cross product of parallel vectors is zero. The reason correctly explains this since the force acts perpendicular to both the current direction and the magnetic field.
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