In this thesis an attempt is made to calculate the power absorbed in different parts of a human block model which is located in free space and is exposed to a plane electromagnetic wave. The moment method is applied to solve an integral equation which relates the incident field to the induced electric field in an arbitrarily shaped biological body. To obtain more accurate results, a numerical integration technique developed here has been used. The computations on the induced electric fields compare well with earlier work done in this area. It has been found that there is indeed heating of tissues outside the region of intended treatment in hyperthermia at 80 MHz.