alleryStart learning →The direction of the magnetic field produced around a straight current-carrying conductor is given by the
Aright-hand thumb rule
BFleming's left-hand rule
CFleming's right-hand rule
DLenz's law
Answer & Solution
Correct answer: A. right-hand thumb rule
1. The field around a straight wire forms concentric circles.
2. The **right-hand thumb rule** (thumb points along the current, fingers curl in the field direction) gives its direction.
3. Fleming's rules apply to force and induced current, not the field of a straight wire.
_Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch13 'Magnetic Effects of Electric Current', §13.2_
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