hi friends!

                  many of us work hard for iit jee! and the Q asked in iit jee are   multiple conceptual questions . for eg if we take iit jee 2008 in physics a passage had come in which the topic friction is combined with rolling , so , let us make a useful points or invent some good equations.regarding these passages !

                     first of all let"s start with me !

                                      when electric and magnetic fields r perpendicular to each other and a charged particle can move with constant velocity with magnitude  v = mod E /mod B

             I hope u guys like my idea !!

help me .