電磁學

电 = 乚 + 曰 : Dorothy Gale (di) is looking for a wall plug for her charger (mnemonic symbol for 电) in the anthill's bathroom (an4). She's digging up the whole place with a shovel (乚), but instead of a wall plug she finds a microphone (曰).

磁 = 兹 + 石 : The King of Chu (c) broke open a mysterious, previously sealed rock (石) made of porcelain (磁) just inside the space station's entrance (Ø2). The rock contained a magnet (磁) which as soon as the King of Chu picked up was so powerful as to attract a Nimitz class aircraft carrier (兹), crashing the hull of the space station.

学 = 小 + 冖 + 子 : Xu Xian wants to study scienceology and learn more about daisies. Just inside the elevator's kitchen, he put some daisies into a prize cup and covered them with a cooking top. He wants to study the growth rate of the daisies depending on the pH of the water in the prize cup.