  Considering a spherically-symmetric non-static cosmological flat model of
Robertson-Walker universe we have investigated the problem of perfect fluid
distribution interacting with the gravitational field in presence of massive
scalar field and electromagnetic field in B-D theory. Exact solutions have been
obtained by using a general approach of solving the partial differential
equations and it has been observed that the electromagnetic field cannot
survive for the cosmological flat model due to the influence caused by the
presence of massive scalar field.
