Electric and magnetic fields of a charged ring in the vicinity of Kerr black hole

220072 Minsk, Belarus 3 ICRANet, Piazza della Repubblica, 10, 65122 Pescara, Italy; ICRA, Dipartimento di Fisica, Sapienza Universit\‘a di Roma, Piazzale Aldo Moro 5, I-00185 Rome, Italy; INAF —IAPS, Via del Fosso del Cavaliere, 100, 00133 Rome, Italy 4 Belarusian State University; Institute of Applied Physics, National Academy of Sciences of Belarus, 16 Academic Str, 220072 Minsk, Belarus; ICRANet-Minsk, National Academy of Sciences of Belarus, 68-2 Nezavisimosti Ave., 220072 Minsk, Belarus Electric and magnetic fields of a charged ring located in the vicinity of Kerr black hole are computed with multipole decomposition. Lines of force of electric and of magnetic fields in the ZAMO frame are presented and analyzed for different positions of the ring and selected values of the Kerr parameter. Special attention is paid to the case when position of the ring approaches the event horizon. Astrophysical applications are discussed.