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Right-hand thumb rule: if the thumb of the right hand points along the direction of current in a straight wire, the curled fingers indicate the:
ADirection of electric current
BDirection of electron drift
CDirection of force on wire
DDirection of magnetic field around wire
Answer & Solution
Correct answer: D. Direction of magnetic field around wire
1. Grip the wire with the right hand, thumb pointing along the current.
2. The curled fingers give the direction of the magnetic field LINES around the wire.
3. Hence concentric circles of B field around a straight current-carrying conductor.
_Source: NCERT Class 10 Science Ch 12 §12.2 Magnetic Field by Current_
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