Author Question: A 1.0-C point charge is 15 m from a second point charge, and the electric force on one of them due ... (Read 200 times)

ereecah · **on:** Jul 29, 2018

A 1.0-C point charge is 15 m from a second point charge, and the electric force on one of them due to the other is 1.0 N.

What is the magnitude of the second charge? (k = 1/40 = 8.99 109 N m2/C2)
A) 10 nC B) 0.025 C C) 25 C D) 1.0 C E) 25 nC

Question 2

A person's eye lens is 2.8 cm from the retina, and his near point is at 25 cm. What must be the focal length of his eye lens so that an object at the far point of the eye will focus on the retina?

A) -2.8 cm
B) 2.8 cm
C) -2.4 cm
D) 2.4 cm
E) 2.2 cm