Magnetic force on a magnetic bead

Micron-size magnetic particles are utilized in different bio-applications. Many in-vivo and in-vitro analysis use these particles because of their interesting abilities to attach to biomolecules. The magnetically actuation of magnetic beads is important to confine the area of the specified cell analysis. Electromagnets and permanent magnets are used for different applications to capture these particles. Therefore exerting optimum force on magnetic particles is crucial in micron size analysis. In this paper we present the magnetic force calculation on a single magnetic bead using magnetic related equations from both permanent and electromagnet sources. It is shown that the magnetic force exerted on larger particles is more than smaller ones.