Question

When comparing the electric field of a charged balloon (static case) to radio waves (time-varying case), which characteristic is present in radio waves but absent in the charged balloon's field?

विकल्प

• The requirement for a physical medium to exist

• Dependence on Coulomb's Law for force calculation

• The ability to propagate through space and carry energy far from the source

• The force exerted on stationary charges near the source

Answer 1

A charged balloon generates a static electric field that surrounds the balloon and exerts forces on nearby charges but does not propagate. Radio waves are generated by oscillating charges in an antenna and propagate through space as electromagnetic waves, carrying energy far from the source regardless of distance. The key distinction is that radio waves represent time-varying fields that actively transport energy through space, while the balloon's static field merely describes the force environment at different locations. This propagation and energy transport capability is unique to time-varying electromagnetic fields generated by accelerated charges.