1. Recall from chemistry that an ion is an electrically charged . Unit IX (Electrostatics) Makeup Exam and Unit X (Circuits) Quiz. Period: . | Honors Physics Name: Unit IX (Electrostatics) Makeup Exam and Unit X (Circuits) Quiz Period: 1. Recall from chemistry that an ion is an electrically charged atom, expressed by the notation X N where X is the chemical symbol and N is an integer representing the number of S 2– fundamental charges the atom has in excess (+) or in deficit (–). For instance, an aluminum atom missing three electrons would × be represented as Al 3+. A sulfur atom with two extra electrons would be represented as S 2–. The grid on the right depicts these two ions situated in space. a. Calculate the magnitude and direction of the net electric field due to both the aluminum and sulfur ions at the point labeled ×. Show your work neatly in the space below. Al 3+ b. Draw in the electric field vector calculated in part (a) on the grid above. (What is important is that you get the direction correct – you may make the arrow any length, within reason). c. Calculate the magnitude and direction of the force exerted on a negatively charged fluorine ion (F –) placed at point ×. (Hint: save time by using the relationship between field and force.) Honors Physics Name: Unit IX (Electrostatics) Makeup Exam and Unit X (Circuits) Quiz Period: 2. The diagram to the right depicts the +25 V, 0 V, –25 V, and –50 V equipotentials in the region of three +1 nC charges and a single –3 nC charge placed between them. a a. Label the equipotential lines with their appropriate voltages. You’ll need to b c d make six labels, but some will have the same value. b. Consider the points a, b, c, and d. i. At which of these four points is the electric potential highest? Circle one and explain below. a b c d ii. At which of these four points is the electric potential lowest? Circle one and explain. a b c d iii. At which of these points is the magnitude of the electric field highest? Circle one and explain. a b c d c. .
