Q

Which rule is used to determine the direction of the magnetic field at the centre of a circular current- carrying loop?

RRB Group D 21 Aug, 2026 (4:30 PM - 6:00 PM) 2026
✓ Answer: C Right-hand thumb rule
The correct choice is Right-hand thumb rule. The result follows from the relevant magnetic-field, electromagnetic-induction or Fleming/right-hand-rule principle.
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