KCET 2021 Physics Solved Paper

In circular motion, net force on the particle is given as
Fr=

mv2

r

=mω2r
where, wis angular speed.
When the rod rotates, electrons in il also rotates which produce electric field E at a distance x.
So, force on electron,
Fe=eE
This force provide the centripetal force,
i.e., Fe=Fc
or eE=mω2x
or E=

m(ω)2X

e