YOU SAID:

when you put a cap on a pen you get the magnetic field

INTO JAPANESE

ペンにキャップをかぶせると磁場が発生します

BACK INTO ENGLISH

A magnetic field is generated when the pen is covered with a cap.

INTO JAPANESE

ペンをキャップで覆うと磁場が発生します。

BACK INTO ENGLISH

A magnetic field is generated when the pen is covered with a cap.