Magnetic field lines form in concentric circles around a cylindrical current-carrying conductor, such as a length of wire. The direction of such a magnetic field can be determined by using the "right hand grip rule" (see figure at right). The strength of the magnetic field decreases with distance from the wire. (For an infinite length wire the strength is inversely proportional to the distance.) Bending a current-carrying wire into a loop concentrates the magnetic field inside the loop while weakening it outside. Bending a wire into multiple closely spaced loops to form a coil or "solenoid" enhances this effect. A device so
High-Intensity Focused Electromagnetic Field muscle contractions due to the action potential. The exposure of muscles to these contractions leads to muscle strengthening. In aesthetic medicine, HIFEM is used as a non-invasive body contouring treatment for abdomen and buttocks. The same technology is used in urology and gynecology to treat urinary incontinence through strengthening of the pelvic floor muscles. A pulse of electric current flowing through a wire coil generates a rapidly changing magnetic field. The changing magnetic field induces a secondary electric current in the nearby tissue. When applied on peripheral level the secondary electrical current depolarizes neural membranes of underlying neurons. Motor neurons