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Describe how you could charge a copper sphere suspended from an insulating thread using the following methods. Describe other materials you might require.

a) Friction

b) Conduction

c) Induction

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

a) Two pith balls each of mass m and carrying charge q aresuspended
from the same point by insulating threads of length L. Findan
expression for the angle each string makes with the vertical.

b) A pith ball of mass m and carrying a charge q is attached to thecenter
of a very large vertical insulating sheet carrying a uniformsurface
charge density s by an insulating thread of length L. Find an
expression for the angle the string makes with the plane.

c) A pith ball of mass m and carrying a charge q is positioned adistance
D from a very large conducting plane. For what value of D wouldthe
electric force on the ball be the same magnitude as in parta)?

d) For each of the three cases above, sketch the total electricfield

everywhere to the left of the plane
Show transcribed image text

(i) A metallic sphere A of radius 1.00 cm is several centimeters away from a metallic spherical shell B of radius 2.00 cm. Charge 450 nC is placed on A, with no charge on B or anywhere nearby. Next, the two objects are joined by a long, thin, metallic wire (as shown in the figure), and finally the wire is removed. How is the charge shared between A and B?

(a) 0 on A, 450 nC on B

(b) 90.0 nC on A and 360 nC on B, with equal surface charge densities

(c) 150 nC on A and 300 nC on B

(d) 225 nC on A and 225 nC on B

(e) 450 nC on A and 0 on B

 

(ii) A metallic sphere A of radius 1 cm with charge 450 nC hangs on an insulating thread inside an uncharged thin metallic spherical shell B of radius 2 cm. Next, A is made temporarily to touch the inner surface of B. How is the charge then shared between them? Choose from the same possibilities.

Suppose you touched a pith ball suspended from an insulating stringto a charged Teflon rod. You then made a second pith ball touch thefirst one with no other objects near by. You then put the top ofthe strings next to each other as shown at right. The two pithballs would be separated by 2 cm. The mass of each pith ball is 0.1g and the length of each of the string is 20 cm. (ignore the massof the strings)

a) What is the magnitude is the electrostatic force on one of thepith balls? You can assume that angle with vertical is small sothat sinΘ ≈ Θ.

F = ___________N (For this problem I dont understand how to set itup because I do not think that I know the q value so I cannot seehow to do the calculation)

b) Assuming the two balls are point charges at the end of thestrings calculate the magnitude of the charge on one of theballs.
Q= ______________ C

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