1. A middle school student asked his teacher, electrons are bound by the electric field of the atomic nucleus, why the protons in the atomic nucleus can continuously generate an electric field, and the energy of the atomic nucleus will not be exhausted?
Static fields do not require energy to maintain.
The explosion of the atomic bomb made mankind see that mass can be converted into energy, but now someone stands in front of the gravitational source and asks, where does the gravitational field energy of the gravitational source come from?
Static fields do not require energy to maintain.
Only under the theory of bending can the energy of the gravitational source be endless. should want to express this meaning, right?
Static fields do not require energy to maintain - no matter which of the four fundamental forces you are talking about.

Static fields do not require energy to maintain.

Static fields do not require energy to maintain.

Static fields do not require energy to maintain - no matter which of the four fundamental forces you are talking about.
Yes, I think this is his basic error. The trouble is that he seems to have invested a lot of effort building a "theory" on his misconceived notion of fields being due to the emission of waves. So now he can't let go of it.

Everyone should be aware of the twin paradox experiment, which tells us that B returning from space travel will be younger than A on Earth.

That much is correct.

The reason given by SR is that there is an acceleration process when B leaves the earth, and a deceleration process when B returns to the earth, so this is the root cause of B's younger age.

The (instantaneous) acceleration (by the traveler) to the initial outbound speed doesn't produce any asymmetry ... they each say the other is ageing more slowly (by the gamma factor).

And the (instantaneous) acceleration of the traveler when they are reunited (so that they are mutually stationary then) produces no effect on their two ages.

So how can it be that the home twin (she) is older when the traveler (he) returns, given that they each say the other is ageing slower during both the outbound and the inbound trips. The only possibility is that, according to HIM, she ages instantaneously during his instantaneous turnaround, by the exact amount that is required to make them agree about their respective ages at the reunion. (And there is a simple equation for computing that).

The most interesting thing is that, if at some distance he instantaneously increases his speed in the direction AWAY from her (instead of TOWARD her), he will conclude that she instantaneously gets YOUNGER!

You're welcome. Over and out.