Trong chân không 2 điện tích điểm cách nhau 10cm thì hút nhau một lực 10 – 6 N. Nếu đem chúng đến vị trí mới cách nhau 2cm thì lực tương tác giữa chúng sẽ là:

Imagine you had to physically add electrons, one at a time, to a previously neutral conductor. you add one electron very easily, but the second electron requires more work. in your initial post to the discussion, explain why this is. also, what happens to the work needed to add the third, fourth, fifth, and subsequent electrons

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.

Write down two additional questions about earth's magnetic field that will make your presentation more informative.