01 Which option gives a possible charge on a free object according to quantization?
Answer and explanation
Correct answer: C. Plus 1.12 × 10^-18 coulomb
Explanation: The governing concept is quantization of electric charge: a free object's charge must be q = ne, where n is an integer and e = 1.6 × 10^-19 C. For option C, (1.12 × 10^-18)/(1.6 × 10^-19) = 7, an integer, so q = +7e is possible. The other values give non-integer multiples of e, so they cannot represent the charge of an isolated free object.