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The direction of magnetic field around a straight current-carrying wire is given by
ALenz's law of induction
BThe right-hand thumb rule
CPascal's law of pressure
DBoyle's law of gases
Answer & Solution
Correct answer: B. The right-hand thumb rule
1. The chapter section on right-hand rule explains it.
2. Hold the wire with the right hand, thumb along current.
3. Fingers then curl in the direction of the magnetic field.
4. So option A is correct.
_Source: Selina Concise Physics Class 10, Ch 10 Electromagnetism (Mistral OCR'd PDF), section on right hand rule_
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