what subjects did he study?
He  obtained his Bachelor of Arts degree in mathematics
J. J. Thomson
He moved on to Trinity College, Cambridge, in 1876. In 1880, he obtained his Bachelor of Arts degree in mathematics (Second Wrangler in the Tripos and 2nd Smith's Prize). He applied for and became a Fellow of Trinity College in 1881. Thomson received his Master of Arts degree (with Adams Prize) in 1883.
what is the exact mass of an electron Approximately 1/1836 that of the proton is the electron a positive charge or a negative charge or is it neutral? Negative charge can you describe any experiment in short where this charge can be produced? UNANSWERABLE what are the names of the scientists who are involved in the discovery of this negative charge? J. J. Thomson what are the applications of this kind of charge? Cathode ray tubes,  computer monitors, television sets,  Vacuum tubes, etc. what are some of the experiments conducted by that scientist you mentioned? One such experiment was Cathode rays. He marked the paths of particles of matter charged with negative electricity which educational institution did he attend? Owens College in Manchester, then moved to  Trinity College
wiki:13393111
J. J. Thomson [SEP] Education and personal life
His parents planned to enroll him as an apprentice engineer to Sharp-Stewart & Co, a locomotive manufacturer, but these plans were cut short when his father died in 1873. He moved on to Trinity College, Cambridge, in 1876. In 1880, he obtained his Bachelor of Arts degree in mathematics (Second Wrangler in the Tripos and 2nd Smith's Prize). He applied for and became a Fellow of Trinity College in 1881. Thomson received his Master of Arts degree (with Adams Prize) in 1883.