Why is a magnetic field a vector quantity? a. directional force b. directional speed c. specified location d. it produces long field lines e. it produced field lines that are close together

The answer is A, a directional force.

Explanation:

For something to be a vector, it must have a value and a direction. A magnetic field always have a direction since goes from negative to positive. The magnetic field lines goes from one pole to the other one and increase his intensity near them.

this means that the temperature of both substances will be equal

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.