Asolid metal sphere with a radius 0.450m carries a net chargeof 0.250nc. find the magnitude of the electric field

a) at a point 0.100m outside the surface of the sphere;
b) at a point inside the sphere, 0.100m below thesurface
correct me if i'm worng but there should be no electic fieldinside the sphere right? (for b)
and i can't get an answer for (a)

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

Which of these metals are magnetic?

Which sentences describe point source pollution? in this type of pollution, the source of the pollution is single and easily identifiable. when runoff water from the melting of snow mixes with debris, it creates pollution. the runoff water, mixed with pollutants, reaches large areas with disastrous effects. alternatively, when a wastewater treatment plant releases harmful chemicals into a stream, the chemicals pollute the stream water because they are not treated for safety.