Amagnetic field would be produced by a beam of(1)x rays(2)gamma rays(3)protons(4)neutrons

(3) protons

Explanation:

Magnetic fields are produced by charged particles in motion. Let's analyze each option:

(1) x rays --> they consist of photons, which are neutral particles, so they don't produce magnetic fields

(2) gamma rays --> they consist of photons, which are neutral particles, so they don't produce magnetic fields

(3) protons --> protons are charged particles, so they can produce magnetic fields if they are in motion

(4) neutrons --> neutrons are neutral particles, so they don't produce magnetic fields

answer; elasticity of the lungs decreases;