Is it obligatory for a wife to wear the niqab if her husband requests it because she will be attending a mixed-gender educational institute?

It is obligatory for the wife to obey her husband in wearing the niqab, even if it is not an obligation, covering is better for protection and modesty, and in emulation of the Mothers of the Believers. She must strive against her soul in obedience and not succumb to the whispers of Satan. It should also be noted that the widespread mixing in universities is an objectionable matter that brings forth trials, and if a woman is compelled to study in mixed environments, she must observe the rulings and etiquette of Islamic law in dealing with non-mahram men.