Which of the following correctly describes the magnetic field near a long straight wire?(a) The field consists of straight lines perpendicular to the wire.(b) The field consists of straight lines parallel to the wire.(c) The field consists of radial lines originating from the wire.(d) The field consists of concentric circles centered on the wire.

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AB is a current carrying conductor in the plane of the paper as shown in the figure below. (i) What is the direction of the magnetic field produced by it at point ‘X’? Write the statement of the rule used to find the direction of field lines. (ii) If the polarity of the battery connected to the wire is reversed, how would the direction of the magnetic field be changed? (iii) Point ‘X’ is at a distance r1 and point ‘Y’ is at a distance r2 (r1

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For minimum flux the angle between the magnetic field and normal to the surface is