Is it permissible for university students to charge their phones or laptops using the university's electricity, and is the teaching assistant's statement that they do not pay for the electricity true?

It is permissible to charge phones and computers using the university's electricity unless the university prohibits it, because the cost of charging is minimal and such matters are tolerated. Sheikh Ibn Jibreen clarified that it is permissible to use some governmental tools and devices for personal need if the usage is minor and does not affect the devices. However, if the cost is significant, it is not permissible except with the permission of the official in charge.