A charge of +2.20 μC is at the origin and a charge of -3.20 μC is on the y axis at y = 40.0 cm. 1) What is the potential at point a, which is on the x axis at x = 40.0 cm? (Express your answer to three significant figures.)

Explanation:

Formula to calculate the potential at point "a" is as follows.

                 =

                 = -4590 V

Therefore, we can conclude that the potential at point a, which is on the x axis at x = 40.0 cm is -4590 V.

the focus of lesson 1 is newton's first law of motion - sometimes referred to as the law of inertia. newton's first law of motion is often stated as. an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

explanation:

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.