How bullet train and circuit breaker work on the magnetic effect of current?

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Can anybody me with this? ? (picture included.)

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid