IT's Your Physics 133

The statement "A charge is measured in Coulombs" is true. Coulomb is the unit of electric charge in the International System of Units (SI). It is named after the French physicist Charles-Augustin de Coulomb. Electric charge is a fundamental property of matter and is measured in Coulombs.

The SI unit for measuring the number of electrons is the coulomb (C). However, the answer "Newton per Coulomb" is incorrect because it represents the unit for electric field strength, not the number of electrons. The electric field strength is measured in newtons per coulomb (N/C), which describes the force experienced by a charged particle per unit charge. Therefore, the given answer is incorrect.

The given answer is correct because according to the law of conservation of electric charge, the total amount of electric charge in an isolated system remains constant. This means that charge cannot be created or destroyed, only transferred or redistributed. Therefore, the algebraic sum of all charges in the system will always remain the same, regardless of any interactions or movements of the charges. Additionally, the answer also correctly states that like charges repel each other, while unlike charges attract each other, which is another fundamental principle of electric charge.

The given statement is false. Electrons are actually negatively charged particles, while protons carry a positive charge. This is a fundamental concept in the field of physics and is a key aspect of understanding the behavior of atoms and their interactions.

Electric field lines represent the direction of the force experienced by a positive test charge placed in the field. Since positive charges are attracted towards negative charges, the electric field lines move from positive to negative. This indicates the direction in which a positive charge would move if placed in the field. Therefore, the correct answer is "Positive to negative."