The rule that determines the direction of a magnetic field produced around a straight conductor carrying current is:
- A. Right-hand thumb rule ✓
- B. Fleming's left-hand rule
- C. Fleming's right-hand rule
- D. Hund's rule
Correct Answer: A. Right-hand thumb rule
Explanation
The Right-Hand Thumb Rule (Maxwell's) states that if the thumb points in the direction of the current, the curled fingers indicate the direction of the magnetic field.
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