Čurrent Attempt in Progress An object has a charge of-2.6 uČ. How many electrons must be removed so that the charge becomes +4.3 µC? Number Units eTextbook and Media

8.

Which of the following charging methods work without ever touching the object to be charged to the object used to charge it? Choose all that apply. a. charging by friction b. charging by contact c. charging by induction

4 Two charges, q1 = 15C and q2= 25C, they are separated in free space by 0.5 m distance. If a metal plate with € = 16.5 x 10-12 is introduced between them, what will be the coulomb force between these charges? Type your answer...

d. Use the definition of electrostatic potential energy Not yet answered Marked out of 2.00 Flag question QUESTION 4 Determine the distance between the electron and proton in an atom if the potential energy U of the electron is 13.4 eV (electronvolt, 1 ev = 1.6 x 10-19 J). Give your answer in Angstrom (1 A= 10-10 m). 0 Answer:: Next page

A glass rod is rubbed to a felt cloth, making the glass become positively charged. Which of the following is true? I. The law of conservation of charge is violated by the process. II. The glass rod gained positive charges III. The cloth became negatively charged IV. The negative charges transferred from the glass rod into the cloth while the positive charges moved from the cloth to the rod.   a. II and III b. IV only c. I, II, III, IV d. III

2. If 6 million electrons are removed from a glass rod, what is the charge on the glass rod in coulombs? 3. A 5 µC charge is placed 2 cm from a -70 µC charge. Find the force between the two charges.

For questions 25–27, suppose that the electrostatics force between two charges is F. What will be the force if the distance between them is halved?  a. 4F b. 2F c. F/4 d. F/2

How many excess electrons does she get? A person scuffing her feet on a wool rug on a dry day accumulates a net charge of -40 µC Express your answer using two significant figures. N = electrons Submit Request Answer Part B By how much does her mass increase? Express your answer using two significant figures. HA Am = Value Units Submit Request Answer Provide Feedback

ELECTROSTATIC CHARGING An uncharged metal sphere hangs from a nylon thread. When a positively charged glass rod is brought close to the metal sphere, the sphere is drawn toward the rod but it the sphere touches the rod, it suddenly flies away from the rod. Why is the sphere first attracted and then repelled?