Grinding quartz crystals down to produce sand is an example of a
a.
change of state.
c.
chemical reaction.
b.
chemical change.
d.
physical change.

Aspherical ball of charged particles has a uniform charge density. in terms of the ball's radius r, at what radial distances inside and outside the ball is the magnitude of the ball's electric field equal to 14% of the maximum magnitude of that field? a)inside the ball: b) outside the ball: