hai điện tích q1=q, q2=-3q cách nhau một khoảng r. nếu điện tích q1 tác dụng lên điện tích q2 có độ lớn là f thì lực tác dụng q2 lên điện tích q1 có độ lớn là. Giải thích giúp mình chi tiết với ạ

If the force on an object is in the negative direction, the work it does on the object must be [2 points a) negative. b) positive c) the work could be either positive or negative, depending on the direction the object moves

Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

Protons and neutrons are found within the nucleus of an atom