No. of articles an fca can take

Dear all, I'm Rana Abraham. I am doing my articleship under a CA from September 24-2012. I intend to write the exam by May 2013 under direct entry scheme. But, i face a lot of problems with my current CA so i wanna change. I found a CA, he is willing to accept me but he is not sure how many articled assistants can he take under him. He is an FCA. Please tell me how many articled assistants can he appoint

Please help