What would be the difference between majoring in Physics, or Applied Physics?

Answer 1

Applied physics is more likely to describe an occupation than a course of study. The logical extension of applied physics is engineering.

The emphasis in physics is understanding how the universe works. The emphasis in the others is taking the physics knowledge we already have, and figuring out how to use it to accomplish an objective.

As an example, the theoretical physicist would study superconductivity and would conjecture the Josephson effect. The experimental physicist would design and conduct experiments to verify the effect. The applied physicist, looking for ways to measure extremely small magnetic fields, would think of making a loop of Josephson junctions and call it a SQUID (see reference). The engineer would design specific SQUID devices for various applications under various conditions.

Answer 2

physics is more theory, applied physics is more practical