alleryThe right-hand thumb rule gives the direction of the field around a:
ACooled ceramic block
BCurrent-carrying wire
CCopper-plated sheet
DCharged glass sphere
Answer & Solution
Correct answer: B. Current-carrying wire
1. Point the thumb of the right hand along the direction of current.
2. The fingers then wrap around the conductor along the field lines.
3. This gives the field direction around a current-carrying wire.
_Source: syllabus Science, Ch 13 'Magnetic Effects of Electric Current'_
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