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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A rod AB of length L and mass m is uniformly charged with a charge Q, and it is suspended from end A as shown in fig. The rod can freely rotate about A in the plane of the figure. An electric field E is suddenly switched on in the horizontal direction due to which the rod gets turned by a maximum angle of 90∘. The magnitude of E is equal of n Mg/Q. Find the value of n.

A rod AB of length L and mass m is uniformly charged with a charge Q, and it is suspended from end A as shown in fig. The rod can freely rotate about A in the plane of the figure. An electric field E is suddenly switched on in the horizontal direction due to which the rod gets turned by a maximum angle of 90∘. The magnitude of E is equal of n Mg/Q. Find the value of n.

A rod AB of length L and mass m is uniformly charged with a charge Q Figure (a) shows a uniformly charged ring of radius r . its axis is along the x- axis and teh ring is in teh yz plane . point P can be anywhere on the x - axis and P' in the xy plane.