Final answer:
To find the number of excess protons in an object with a 12 nC charge, the object's total charge is divided by the charge of a single proton, resulting in 7.5×1010 protons.
Step-by-step explanation:
To determine how many excess protons an object with a charge of 12 nC (nanocoulombs) has, we need to understand the relationship between charge and particles. Each proton has an identical charge but opposite in sign to an electron, which is approximately 1.60×10-19 C (coulombs). This means the charge of one proton is +1.60×10-19 C.
By dividing the total charge of the object by the charge of a single proton, we can calculate the number of excess protons. The calculation process is as follows:
- Total charge of the object: 12 nC = 12×10-9 C
- Charge of one proton: 1.60×10-19 C
- Number of excess protons: (12×10-9 C) / (1.60×10-19 C/proton) = 7.5×1010 protons
Therefore, an object with a charge of 12 nC has 7.5×1010 excess protons.