The number of slots and electromagnetic core effects on Eddy Current Brake performance: a computational approach by Wahyu Dwi Aprian, Wahyu Dwi Aprian, Ubaidillah, Ubaidillah, Muhammad Nizam, Muhammad Nizam, Mufti Reza Aulia Putra, Mufti Reza Aulia Putra, Mazlan, Saiful Amri