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(B) According to the Biot-Savart law and the right-hand thumb rule,a moving charge creates a magnetic field.For a positive charge moving away from an

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closed curves in clockwise direction.

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(B) According to the Biot-Savart law and the right-hand thumb rule,a moving charge creates a magnetic field.For a positive charge moving away from an observer,the direction of the current $I$ is away from the observer.Using the right-hand thumb rule,if you point your right thumb in the direction of the motion of the positive ion (away from the observer),your fingers curl in the clockwise direction.Therefore,the magnetic field lines (lines of force of magnetic induction) form closed concentric circles around the path of the ion in the clockwise direction.

If a positive ion is moving away from an observer with some acceleration,then the lines of force of magnetic induction will be

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