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प्रश्न
What shape are the magnetic field lines around a current-carrying straight wire?
विकल्प
Ellipses centred on the wire
Radial lines pointing away from the wire
Straight lines parallel to the wire
Concentric circles around the wire
MCQ
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उत्तर
A current-carrying straight wire produces magnetic field lines as concentric circles around it. Their direction follows the right-hand thumb rule.
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