7/10/2020 Student Response | Pivot Interactiveshttps://app.pivotinteractives.com/assignments/5ec5dcc874b9eb002d493d40/responses 1/51.2.Secon 01: Electric Charge Transfer: Contact and InduconTotal Score: _______ / 37sydney marquezLearning ObjecvesScore: 1 / 1  1 / 2 submissions remainingComments:In this acvity, we'll explore how a device called an electrophorus can be used to transfer electric charges to conducng spheres. Part 1: Making PrediconsIn the video below we will charge the electrophorus, or a device that generates stac electricity. It is the metal disk on the right side of the video below. Use the video to answer the following quesons.Video instance not printed.The first step was to rub cat fur on a piece of foam. What happens to the surface of the foam?It becomes negavely charged.It becomes posively charged.It does not gain a charge. Submit AnswerCorrect!What does it mean for something to have a negave charge, and what does that tell us about the number of electrons?It has fewer electrons than protons It has more electrons than protons7/10/2020 Student Response | Pivot Interactiveshttps://app.pivotinteractives.com/assignments/5ec5dcc874b9eb002d493d40/responses 2/53.4.Score: 3 / 3  1 / 2 submissions remainingComments:Score: 2 / 2  1 / 2 submissions remainingComments:Score: 3 / 3  1 / 2 submissions remainingComments:It has nothing to do with the number of electrons and protons.Submit AnswerCorrect!The foam is an insulator, meaning it won't conduct electrons. The metal plate, or electrophorus, is a conductor, meaning electrons can flow freely through it. What happens when the plate is placed against the foam?The extra electrons in the foam conduct into the metal, causing it to also be negavely charged.The negave charge of the foam pulls in electrons, leading to more electrons near the foam and fewer toward the upper rim of the metal plate. The negave charge of the foam pushes away electrons, leading to fewer electrons near the foam and more toward the upper rim of the metal plate. Submit AnswerCorrect!When someone touches the rim, a shock can be heard. What is happening to cause the shock?Electrons from the hand are conducng into the posively charged region of the metal near the foam. This means there are more electrons in the electrophorus leading to a negave charge. Electrons from the negavely charged rim are being conducted into the hand. This means there are fewer electrons in the electrophorus leading to a posive charge. Electrons from the negavely charged rim are being conducted into the hand. This balances the charge in the electrophorus, making it a neutral charge. Submit Answer7/10/2020 Student Response | Pivot Interactiveshttps://app.pivotinteractives.com/assignments/5ec5dcc874b9eb002d493d40/responses 3/55.6.Hint:7.8.Score: 0 / 4Score: 0 / 4Score: 0 / 4Score: 0 / 4Correct!The two metal spheres on the le side of the video are neutrally charged. What will happen to the charge of one of the spheres when we tap it with the electrophorus' metal plate. Does the sphere become charged and if so, is it posive or negave?The sphere will become negavely charged because the metal plate is posive. The boom sphere is supported by the scale, while the top sphere cannot move. If we also tap the other sphere with the electrophorus (aer recharging it using the same process in the video above), what will happen to reading on the scale? Why?The reading will increase because doing that will deccrease in the force in the electric field between the two spheres.Instead of touching a sphere with the electrophorus, we instead hold the electrophorus near the sphere and touch the opposite side of the sphere with our hand.• What happens to the electrons in the sphere as the electrophorus is placed near it? • What will happen when we tap the opposite side with our neutrally-charged hand?• Does the sphere become charged and if so, is it posive or negave?At these scales, air is an insulator. the electrons are pushed to the otherside of the sphere where the plate is not touching it. If we touch it our hand will get shocked and the sphere becomes posively charged.What happens to the apparent weight of the boom sphere...• ... if we follow the procedure in the previous queson on both spheres? • .... if we follow the procedure in the previous queson on the top sphere and tap the boom sphere with the electrophorus? The boom spheres force will increase if the plate touches it , and the top sphere will sll cause the scale to decrease if the plate is near it.7/10/2020 Student Response | Pivot Interactiveshttps://app.pivotinteractives.com/assignments/5ec5dcc874b9eb002d493d40/responses 4/51.2.3.4.Score: 0 / 4Score: 0 / 4 Part 2: Tesng PrediconsFirst, let's label some terms:Conducon is what happens when we tap the electrophorus against the sphere. Inducon is what happens when we hold the electrophorus near the sphere, then tap the other side of the sphere with our finger.Video instance not printed.Where your predicons correct? If not, how did they differ from the videos?Yes they were correcct.What is happening to the electrons during the conducon trials? What is the charge of the sphere aerwards? During the conducon trials, the electrons are at the place where the plate is touching but once it is removed the electrons spread around the ball and is negavely charged.What happens to the electrons during the inducon trials? What is the overall charge of the sphere immediately aer we touch it? The balls are polarized and the electrons will move to the opposite side of the ball from where the plate is and the posive will go towards the ball. The ball is posive.What would happen if, while touching the sphere trying to cause inducon, we move the electrophorus away before the hand is removed?Then the transferred electrons will stay and not be returned to the plate. and now the system is only thee hand and the ball.7/10/2020 Student Response | Pivot Interactiveshttps://app.pivotinteractives.com/assignments/5ec5dcc874b9eb002d493d40/responses 5/5Save & CloseSaveScore: 0 / 4Saving your response will also submit any unsubmied mulple choice