Author Question: Light travels fastest A) in a vacuum. B) through water. C) through glass. D) through plastic. ... (Read 140 times)

stock · **on:** Jul 27, 2018

Light travels fastest

A) in a vacuum.
B) through water.
C) through glass.
D) through plastic.
E) through diamond.

Question 2

Two point charges of + 30.0 C and - 9.00 C are separated by a distance of 20.0 cm. A +7.00 C charge is placed midway between these two charges. What is the electric force acting on this charge because of the other two charges?

A) 0.453 N directed towards the negative charge
B) 2.45 N directed towards the negative charge
C) 2.45 N directed towards the positive charge
D) 245 N directed towards the positive charge
E) 245 N directed towards the negative charge