Uh. Right.
So if you can provide an equation linking energy to something, then suddenly that thing IS energy, by your science? Why then “capacitance is energy! Charge is energy! Everything is, like, energy man!” by your amazing new science. You’d better hurry & patent this idea. You’re going to be rich..
Not my science. By the properties of matter and energy that God created.
Magnetic fields store energy. Think of it like gravity. If you stand on earth, hold a 5-lb weight 5 feet in the air, then the system of the earth and the weight has potential energy. When you drop the weight, gravity converts that potential energy into kinetic energy. Once it hits the earth, the weight no longer has potential energy.
The same thing happens when you a steel ball bearing on a table and put a magnet nearby so that the ball bearing is in the magnetic field of the magnet.
Until you understand magnetism, I won't even go into energy carried by electromagnetic waves.