A Level Physics Practice Exam

What is the charge of a proton?

1. 1.6 × 10^-19 C

2. 8.32 × 10^-19 C

3. 1.6 × 10^-27 C

4. 0 C

The correct answer is: 1.6 × 10^-19 C

The charge of a proton is a fundamental constant in physics, specifically defined as approximately 1.6 × 10^-19 coulombs. This value is equal in magnitude but opposite in sign to the charge of an electron, which is -1.6 × 10^-19 coulombs. This fundamental charge underlies the structure of atoms, as protons contribute positively to the overall charge of the nucleus, balancing the negative charge of the surrounding electrons. Understanding the charge of a proton is crucial when discussing electric forces, fundamental interactions, and the stability of atomic structures. The other options do not represent the true charge of a proton. The second option reflects a value that is larger than the known charge, while the third option provides a value that is significantly smaller and also does not correspond to any known elementary charge. Lastly, the fourth option indicates a neutral charge, which does not apply to a proton, as it is inherently positively charged.