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Exam 15: Electric Forces and Electric Fields

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Question 21

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An initially uncharged hollow metallic sphere with radius of 5 cm has a small object with a charge of +10 µC carefully placed at the center of the sphere through a hole in the latter's surface.What charge resides inner surface of the sphere?

A) -4 000 µC
B) -10 µC
C) +10 µC
D) zero

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Question 22

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A 6.0 mC charge is placed at the origin and a second charge is placed on the x-axis at x = 0.30 m.If the resulting force on the second charge is 5.4 N in the positive x-direction,what is the value of its charge?

A) 9.0 mC
B) 9.0 nC
C) -9.0 mC
D) -9.0 nC

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Question 23

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A spherical volume of space has an electric field of intensity 100 N/C directed radially outward from it surface of radius 0.600 m.What is the net charge enclosed within this surface?

Two equal charges,each Q,are separated by some distance.What third charge would need to be placed half way between the two charges so that the net force on each charge would be zero?

An electron with a charge value of 1.6 x 10^-19 C is moving in the presence of an electric field of 400 N/C.What force does the electron experience?

Electric field is dimensionally equivalent to which of the following?

The average distance of the electron from the proton in the hydrogen atom is 0.51 x 10^-10 m.What is the electric field from the proton's charge at the location of the electron? (k_e = 8.99 x 10⁹ N*m²/C²,e = 1.6 x 10^-19 C)

If body P,with a positive charge,is placed in contact with body Q (initially uncharged) ,what will be the nature of the charge left on Q?

Three equal positive charges are placed on the x-axis,one at the origin,one at x = 2 m,and the third at x = 4 m.Of the following points,which has the greatest magnitude electric field?

About how many electrons are in 30 grams of water (H₂O) ?

A charge Q accumulates on the hollow metallic dome,of radius R,of a Van de Graaff generator.A probe measures the electric field strength at various points outside the sphere surface.If the probe is initially at a distance 3R from the sphere's center and then is moved to 4R,by what factor will the electric field reading change?

When a glass rod is rubbed with silk,which of the following statements best describes what happens?

Charges of 4.0 µC and -6.0 µC are placed at two corners of an equilateral triangle with sides of 0.10 m.At the third corner,what is the electric field magnitude created by these two charges? (k_e = 8.99 x 10⁹ N·m²/C²)

Charge A has 10 electric field lines coming out,Charge B has 20 lines coming out,and Charge C has 30 lines coming in.Which pair of these charges will have the largest force between them if placed one cm apart?

Two point charges are separated by 10.0 cm and have charges of +2.00 µC and -2.00 µC,respectively.What is the electric field at a point midway between the two charges? (k_e = 8.99 x 10⁹ N·m²/C²)

Two small objects are suspended from threads.When the objects are moved close together,they attract one another.Which of the following could produce this result?

A 6.00 mC charge is placed at the origin and a second charge is placed on the x-axis at x = 0.300 m.If the resulting force on the second charge is 6.40 N in the positive x-direction,what is the force on the charge at the origin?

In x-ray machines,electrons are subjected to electric fields as great as 6.0 x 10⁵ N/C.Find an electron's acceleration in this field.(m_e = 9.11 x 10^-31 kg,e = 1.6 x 10^-19 C)

In the Millikan oil-drop experiment it was found that oil droplets:

Two point charges each have a value of 30.0 mC and are separated by a distance of 4.00 cm.What is the electric field midway between the two charges? (k_e = 8.99 x 10⁹ N·m²/C²)