Current flows through a straght thinwalled tube of radius r. The magnetic field at a distance x from the axis of the tube has magnitude B.

(a)B∞x,for 0<x<r

(b)B∞1/x,for0<x>r

(c)B=0,for,0<x<r

(d)B=0,only for x=0

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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