  Thermodynamic properties of a Yukawa system consisting of dust particles in
plasma are studied in presence of an external magnetic field. It is assumed
that dust particles interact with each other by modified potential in presence
of magnetic field. Accordingly, a modified expression for internal energy has
been obtained. A molecular dynamics code is developed to calculate this
internal energy for the entire system. Based on the values of internal energy
given by the code Helmholtz free energy and pressure are calculated for the
system. Our study shows novel kind of behaviour for internal energy in presence
of magnetic field. Thermodynamic properties are affected significantly by
magnetic field. The study helps to express internal energy as a function of
Coulomb coupling parameter and magnetic field.
