Cho hai quả cầu nhỏ điện tích q1=9uC và q2=4uC đặt cách nhau 10cm trong không khí a. Tính lực tương tác giữa hai điện tích
b. Khi đặt hai quả cầu phải bằng bao nhiêu để lực tương tác không đổi

Abird sitting high in a tree is an example of what type of wnergy

An charge with mass m and charge q is emitted from the origin, (x,y)=(0,0). a large, flat screen is located at x=l. there is a target on the screen at y position y(h), where y(h) > 0. in this problem, you will examine two different ways that the charge might hit the target. ignore gravity in this problem. 1.assume that the charge is emitted with velocity v(0) in the positive x direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive y direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l. 2.now assume that the charge is emitted with velocity v(0) in the positive y direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive x direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l.

How much energy is supplied to each coulomb of charge that flows through a 12-v battery?