Line B touches the circle at a single point. Line A extends through the center of the circle. I. What is line b in reference to the circle?
2. How large is the angle between lines A and B?

If I understand correctly. Line B is parallel to the circle. Also, the angle is less than 90.

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete