you solve it questions ( 2 per law) these must be math based and you must show all work and steps to arrive at the answer.
i need two you solve it questions newtons 1st and 3rd law
i appreciate any < 3

Three point charges, two positive and one negative, each having a magnitude of 20 μc are placed at the vertices of an equilateral triangle (30 cm on a side). what is the magnitude of the electrostatic force on the negative charge

Why there is no inductive reactance in dc circuits

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.