Final answer:
The charge produced in a b-g cavity with equilibrium thickness copper walls will remain the same regardless of whether it's filled with air or hydrogen when subjected to identical gamma-ray irradiations, as the charge production is reliant on interactions with the cavity walls rather than the gas type or mass.
Step-by-step explanation:
Regarding the question about the charge produced in a b-g cavity (presumably a gamma radiation cavity) with equilibrium thickness copper walls when filled with air vs. hydrogen, the charge produced by identical gamma-ray irradiations would remain the same. This is because the charge produced in such radiation interactions is not dependent on the type of gas but rather on the amount of energy imparted by the gamma rays to the cavity walls and the subsequent interactions that produce ionization and charge. The mass of the gas does not affect this process as the photon interactions are with the cavity material (copper walls) and not with the gas itself.
In reference to the other physics problems listed, these contexts involve concepts such as charge distribution, magnetic fields, coulomb's law, capacitance, resistance and current, and mass-spring systems. Each problem examines the application of physics principles to theoretical situations where different physics variables are altered.