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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > In figure, AB is a non- conducting rod. Equal charges of magnitude q are fixed at various points on the rod as shown. The rod is rotated uniformlly about an axis passing through O and perpendicular to its length such that linear speed at the end A or B of the rod is 3 m/s. Magnetic field at O is

In figure, AB is a non- conducting rod. Equal charges of magnitude q are fixed at various points on the rod as shown. The rod is rotated uniformlly about an axis passing through O and perpendicular to its length such that linear speed at the end A or B of the rod is 3 m/s. Magnetic field at O is

A cylindrical wire of radius R is carrying current uniformly distributed current i over its cross section . If a circular loop of radius r is taken as amperian loop In figure then the variation value of phi B.dl over this loop with radius r of loop will be best represented by