alleryThe force on a current-carrying conductor in a field is largest when current and field are:
AIn the same plane
BAt a small angle
CAt right angles
DIn one direction
Answer & Solution
Correct answer: C. At right angles
1. The displacement of the rod changes with the angle between current and field.
2. It is largest when the direction of current is at right angles to the magnetic field.
3. In that condition Fleming's left-hand rule gives the direction of the force.
_Source: syllabus Science, Ch 13 'Magnetic Effects of Electric Current'_
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