alleryDirection of force on a current-carrying conductor placed in a magnetic field is reversed if:
AOnly the current is reversed
BOnly the field is reversed
CBoth current AND field are reversed
DNeither — the force is fixed
Answer & Solution
Correct answer: C. Both current AND field are reversed
1. F = I L × B. Reversing either I or B reverses F.
2. Reversing BOTH simultaneously flips the sign TWICE — back to the original direction.
3. So the force is the SAME when BOTH are reversed (not the opposite).
4. Use Fleming's left-hand rule to verify.
_Source: syllabus Science Ch 12 §12.4 Force on Current in Magnetic Field_
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