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  1. 1. A compass needle aligns itself along the direction of a magentic field line. On the first diagram (the current loop), field lines run from the fron to the back. Hence, the noth-pole of the needle is pointing towards the back for the compass placed at the...

  2. ...: you can follow the answer made by Gabriella Montez ~ mock exam in progress" ^^ 希望你能明白我的邏輯,要完全明白何謂conservation of linear...

  3. 你試下問d 師兄, 師姐借佢地Form 1個陣d exam paper 啦... 我覺得咁仲有用...