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The right-hand thumb rule is used to find the direction of the magnetic field around a current-carrying conductor. In this rule, the thumb points along the:
ADirection of the magnetic field
BDirection of motion of the conductor
CDirection of the force on the wire
DDirection of the current
Answer & Solution
Correct answer: D. Direction of the current
1. In the right-hand thumb rule the conductor is gripped in the right hand.
2. The chapter states the thumb points in the direction of the current, and the curled fingers give the direction of the magnetic lines of force.
3. The option reverses the rule; the fingers, not the thumb, show the field.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 4 "Effects of Electric Current", p.62_
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