An infinetily long conductor PQR is bent to form a right angle. A current of I passes through PQR . The magnetic field at ponit M which is above Q at a didtance d is B1 . Now another infinitely long straight conductor QS i connected to Q so that the current is (½)I in both QR and QS ,the current in PQ remaining unchanged. the magnetic field at M is now B2 . Then find the ratio of B1 and B2.

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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