Question

use the information, picture, and table to answer the following question.
during an investigation of methods of charge transfer, students are asked to make an electroscope using a flask. they insert a metal rod through a stopper and bend a hook on the end that will be inside the flask. they have a bent piece of metal on the hook to create foil leaves. once the stopper has been pushed into place, they attach a metal ball to the end of the metal rod sticking out of the flask.
the students are asked to use an acrylic rod to charge the electroscope by conduction. they begin to develop the following procedure:

step	procedure
2	observe any movement of the foil leaves inside the flask.
3	charge the rod.
4	ground the electroscope by touching a conductive material to the metal ball.

1,2,3,4
1,3,2,4
2,3,4,1
4,3,1,2

Explanation:

Step1: Recall charging by conduction steps

Charging by conduction requires first preparing the charged object, then transferring charge, then observing the result. Grounding is a separate step that would discharge the electroscope, so it is not part of charging by conduction to make the leaves move.

1. First, charge the acrylic rod (Step 3).
2. Then, touch the charged rod to the metal ball to transfer charge (Step 1).
3. Next, observe the movement of the foil leaves (Step 2).
4. Grounding (Step 4) would discharge the electroscope, so it is not part of the charging procedure to observe leaf movement, but evaluating the options, the only logical order for charging and observing is 3,1,2, with 4 being an extra step that would be done after, but the option that follows the correct charging sequence is 1,3,2,4? No, correct order: Charge rod first (3), touch to ball (1), observe leaves (2). Grounding (4) is done after to reset. So the order of steps to perform charging by conduction and observe is 3,1,2, then 4. Looking at the options, 1,3,2,4 is the only one that has the charging steps in the right sequence after correcting the initial mistake: you must charge the rod before touching it to the ball.

Step2: Match to the correct option

The correct sequence is: Charge the rod (3), touch rod to metal ball (1), observe foil leaves (2), ground electroscope (4). This matches the option 1,3,2,4? No, wait: no, the order of actions is first charge the rod (3), then touch to ball (1), then observe (2), then ground (4). So the numerical order is 3,1,2,4, which is the second option.

Answer:

1, 3, 2, 4