# _002 - Solution for Homework 2 Simple Electric Devices and...

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Solution for Homework 2 Simple Electric Devices and Processes Solution to Homework Problem 2.1(Shielding By Conductor) Problem: The insulated tube (negative charge) is brought near an uncharged conducting can. In the conductor is a positively charged pith ball. Select the fgure that shows the expected orientation oF the pith ball. Select One oF the ±ollowing: (a) ±igure (a) (b-Answer) ±igure (b) (c) ±igure (c) GT conductor + _ _ pith Figure (a) GT conductor + _ _ pith Figure (b) GT conductor + _ _ pith Figure (c) Solution (b) the conductor shields the pith ball From the electric feld oF the golF tube. Total Points for Problem: 3 Points Solution to Homework Problem 2.2(Sign of Electroscope) Problem: Consider a leaF electroscope. With no external charges near the electroscope, the leaves are de- ²ected. A negatively charged tube is brought near the electroscope and the leaves hang straight down (become unde²ected). What is the sign oF the net charge oF the electroscope? No charge escapes or is transFerred to the electroscope. Select One oF the ±ollowing: (a-Answer) Positive. (b) Negative (c) Zero. (d) Positive or zero, but not negative. 1

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(e) Negative or zero, but not positive. (f) Can’t tell. Solution The electroscope is charged because the leaves are initially deFected. As the negatively charged golf tube is brought near, the net charge is drawn to the bolt and the leaves become neutral. Since opposites attract, the electroscope must be positively charged. Total Points for Problem: 3 Points Solution to Homework Problem 2.3(Charge Transferred to the Electroscope) Problem: Using the electrophorus and electroscope from lab, the following sequence of actions is performed. (1) The wall board is given a negative charge by rubbing with the oven bag. (2) The electrophorus is placed on the wall board. (3) The electrophorus is grounded. (4) The electrophorus is picked up by the insulating handle. (5) The metal pan of the electrophorus is touched to the bolt of the electroscope causing the leaves to deFect. What is the sign of the net charge transferred to the electroscope? Select One of the ±ollowing: (a-Answer) Positive. (b) Negative. (c) Zero. (d) Either positive or zero. (e) Either negative or zero. Solution (a) Since the wall board is negative, the electrophorus charges positive. Therefore, a positive charge is transferred to the electroscope. Total Points for Problem: 3 Points
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## This note was uploaded on 05/04/2008 for the course PHYS 2074 taught by Professor Stewart during the Spring '08 term at Arkansas.

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_002 - Solution for Homework 2 Simple Electric Devices and...

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