Consider the magnetic field produced by a lon | vedclass

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(D) For a long straight current-carrying wire,the magnetic field lines are concentric circles centered on the wire,as described by the right-hand thum

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All of the above.

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(D) For a long straight current-carrying wire,the magnetic field lines are concentric circles centered on the wire,as described by the right-hand thumb rule. This validates option $A$.The magnitude of the magnetic field at a distance $r$ from the wire is given by $B = \frac{\mu_0 I}{2\pi r}$.Since the magnetic field $B$ depends only on the perpendicular distance $r$ from the wire,all points on a cylinder of radius $r$ coaxial with the wire have the same magnetic field magnitude. In any plane containing the wire,there are two points at a distance $r$ from the wire (one on each side) where the magnitude of the magnetic field is the same. This validates option $B$.Since there are infinitely many points at the same perpendicular distance $r$ from the wire (forming a circle around the wire),there are a large number of points where the magnetic field magnitude is the same. This validates option $C$.Therefore,all the given statements are correct.

Consider the magnetic field produced by a long straight current-carrying wire.

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