List of top Physics Questions on Magnetic Field asked in WBJEE JENPAS UG

Consider the two different situations X and Y of two concentric coils of N₁ and N₂ turns and radii R₁ and R₂ respectively as shown above. If the magnetic field at O in situation X is B_x and in situation Y is B_y then B_x−B_y is

A convex lens of focal length 10 cm produces a five-times magnified real image of an object. What is the object distance ?

A wire in the form of a semi-circle rotates about the diameter of the circle with angular frequency o in a uniform magnetic field perpendicular to the diameter of the circle. Then mean electrical power generated is