B Two uncharged (neutral) hollow aluminum spheres, mounted on insulating posts,
ID: 1633296 • Letter: B
Question
B Two uncharged (neutral) hollow aluminum spheres, mounted on insulating posts, stand near each other, but not touching. Each has a radius of 10 cm, with a gap of2.o cm between them. Use this information for the first 9 questions. 29 1 To say that the spheres are uncharged means that a. they have no electrons or protons in them. b. they have virtually equal numbers of protons and electrons. c. they have recently been grounded. d. we paid cash for them? | 2) Now suppose that a charge ofi6 C (that's 1.6 x 10° C) is added to the left sphere, A. How many electrons does that represent? (The mass number of aluminum is almost exactly 27) a. 3-7 x 10 b, 1.0 x 10'3 c. 2.7 x 10 3) What is the value of the electric field strength, E, inside sphere A? a. zero b. 230 N/c C. 1.44 x 10 N/c d. 1.44 x 10 N/c 4) What's the value of the electric potential, V, on the surface of sphere A? a. zero b. 230 V C. 1.44 x 10 v d. 1.44 x 10VExplanation / Answer
Answer
1. Uncharged means both positive and negative charge is equal.
They have virtually equal no. of proton and electron.
Option b)
2. Charge on one electron = 1.6*10-19 C
No. of electrons for having 1.6*10-5 C,
n = 1.6*10-5/(1.6*10-19) = 1*1014
opion d)
3.Electric field inside a hollow conducting sphere is zero, E = 0
option a)
4.Electric potential V = kq/r
V = 9*109*1.6*10-5/0.1 = 1.44*106 V
option c)
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