Question Detail
Question
A current of 3A flows through a metre-length conductor. Calculate the force experienced by this conductor if a quarter of its length is perpendicular to a magnetic field of 0.5T.
Correct Answer
Option C is the correct answer.
Detailed Explanation
Only the quarter-length (0.25m) portion perpendicular to the field contributes: F = BIL = 0.5×3×0.25 = 0.375N.
Hint
Only the length of conductor that is actually perpendicular to the field contributes to the force — use F = BIL with that length.