A small square loop of wire l is placed inside a square loop of wire of side L(L>>l).The loops are co-planer and their centres coincide.The mutual inductance of the system is proportional toA)l/LB)L2 /lC)L/lD) l2 /Lplease give me the complete and simple explanation to this answer...

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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