Which of the following transitions in hydrogen atom produces longest wavelength of radiation (or photon of minimum energy)?

A

n = 2, p = 4

B

n = 3, p = 4

C

n = 6, p = 8

D

n = 5, p = 6

Electrostatics question based on earthing of spherical shell

an object has a charge of 2c and gains 10^19 electrons. the net chaarge on the object becomes??

A wire with a linear charge density lambda forms a quarter of a cjrclenof radius R and is placed asa shown in thefigure with its centre of curvature at the origin O the electric field at O will be

Find the value of q so that system remains in equilibrium.. figure attached below

Need to find the time taken for the dipole to come back to eqm