Magnetoelastic gels are active materials, prepared from magnetoresposive micro/nano particles and polymer materials. The magnetic particles are embedded in the polymer matrix to form this composite material. In order to study the theoretical aspects of magnetoelastic materials, an energy minimization scheme is used, that takes inputs from the micromagnetics theory, interaction energy between particles and elastic energy of the polymer. The total energy is then minimized numerically to find the magnetization and strain within the magnetoelastic gel. Real gels were then prepared using triblock copolymer and carbonyl iron particles, and static shear tests on them establish a particle size effect.