Final answer:
The answer to the question about sharecroppers is true. Charging by polarization doesn't require direct contact, hence false. And, displacement typically changes if the path taken is not as intended, making the last statement false.
Step-by-step explanation:
The original question regarding contact and account sharing rules is not associated with a subject area as such and seems out of context, hence not answered directly.
However, the correct answer to Exercise 17.3.3 is true, as sharecroppers were indeed tenant farmers who, historically, would pay their rent by giving a portion of their crop yields as payment. Regarding the true or false question about polarization, the answer is false.
Charging an object by polarization does not require direct contact with an object carrying excess charge, as polarization can occur in the presence of an electric field.
Lastly, the statement about displacement being the same even when directions are not followed correctly is, in a general sense, false. Displacement is a vector quantity and would differ if the directions followed are not as intended.