I will exercise what I have learned about Coulomb's law from a written workshop. A charge of 4×10^-6 C is 100cm from a charge of -7×10^-6 C, what is the force of attraction between the charges?

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Ejercitaré lo aprendido referente a ley de Coulomb a partir de taller escrito.

Una carga de 4×10^-6 C se encuentra 100cm de una carga de -7×10^-6 C, ¿Cuál es la fuerza de atracción entre las cargas?

it takes about 30 days for it to break down

im guessing the west of station b

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.