Question

The relative electric permittivity of a medium is 9 and relative permeability is

close to unity, what is the speed of electromagnetic waves in medium ?​

Answer 1

Answer:

• Root mean square (r.m.s.) or virtual value of a.c.: It is that steady current, which when passed through a resistance for a given time will produce the same amount of heat as the alternating current does in the same resistance and in the same time. It is denoted. Irms or Iv.