With the theory and technology of electromagnetic shielding, it is proved by experiments that electromagnetic force is related to gravity, and electromagnetic force and gravity belong to the four basic forces in physics.

Electromagnetic shielding is an existing theory and mature technology.

When there is a shielded electromagnetic force inside an object, obviously, it is impossible to measure the electromagnetic force between this object and another object with Coulomb torsion balance, because the electromagnetic force is shielded.

The gravitational force between this object and another object can't be measured by Cavendish torsion balance, because there is a shielded electromagnetic force inside this object.

Coulomb torsion balance is an instrument for measuring electromagnetic force, and Cavendish torsion balance is an instrument for measuring universal gravitation.

For example, before and after shielding capacitor charging, balance weighing experiment, torsion balance measurement experiment and pendulum measurement experiment.

I have done many experiments, and the experimental report has been uploaded to the domestic preprint service system.

Baidu, the shielding electromagnetic force affects the gravitational effect.

Liu Wuqing's Three Effects

Note: Because of the same name, I entered the word Liu Wuqing in China Knowledge Network. I wrote the paper on physics, but I didn't write the paper on medicine.