When a magnetic compass needle is carried nearby to a straight wire carrying current, then (I) the straight wire cause a noticeable deflection in the compass needle. (II) the alignment of the needle is tangential to an imaginary circle with straight wire as its centre and has a plane perpendicular to the wire

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When a magnetic compass needle is carried nearby to a straight wire carrying current, then (I) the straight wire cause a noticeable deflection in the compass needle. (II) the alignment of the needle is tangential to an imaginary circle with straight wire as its centre and has a plane perpendicular to the wire