Implementation of online problem-based learning assisted by digital book with 3D animations to improve student's physics problem-solving skills in magnetic field subject

The magnetic field is a more complex and abstract physics subject than other subjects, causing students' low ability to solve problems. So there need for learning instruments overcome these problems, especially when online during the COVID-19 pandemic. Research creates implements an problem-based (OPBL) assisted by digital books with 3D animation improve problem-solving skills on subjects. aimed analyze validity, effectiveness, student responses used. method used in this research quantitative using quasi-experiment survey methods. results showed that instrument was valid reliable use terms of content constructs. According statistical test results, also effective improving Furthermore, student's response very positive, making activity innovative fun. implies OPBL can be solution skills, period.