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Exam 17: Electric Forces and Fields

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Question 21

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A proton initially moves left to right long the x axis at a speed of 2.00 * 10³ m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.300 m before coming to rest. If the proton's mass and charge are 1.67 *10 ^{- 27} kg and 1.60 *10 ^{- 19} C, respectively, what is the magnitude of the electric field?

A) 13.9 N/C
B) 0.0696 N/C
C) 28.3 N/C
D) 0.104 N/C

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Question 22

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The number of electric field lines passing through a unit cross sectional area is indicative of:

A) field strength.
B) charge motion.
C) field direction.
D) charge density.

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Question 23

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A spherical volume of space has an electric field of intensity 170 N/C directed radially outward from it surface of radius 0.600 m. What is the net charge enclosed within this surface?

A conducting spherical shell of inner radius and outer radius has a charge Q on it. The flux through a concentric spherical surface of radius is . An additional charge, also Q, is then added to the sphere. What is the change in flux through a concentric spherical surface of radius when the additional charge is placed on the conducting shell?

We have an initially uncharged hollow metallic sphere with radius of 5.0 cm. I place a small object with a charge of +40 µC at the center of the sphere through a hole in the surface. Find the electric field present at a point 10 cm from the sphere's center. (k_e = 8.99 *10⁹ N.m²/C²)

Two point charges are separated by 10.0 cm and have charges of +1.00 µC and -1.00 µC, respectively. What is the electric field at a point midway between the two charges? (k_e = 8.99 *10⁹ N·m²/C²)

A spherical surface surrounds a point charge at its center. If the charge is quadrupled and if the radius of the surface is doubled, what happens to the electric flux $\varPhi$ _E out of the surface and the magnitude E of the electric field at the surface as a result of these doublings?

Of the following substances, which one contains the highest density of free electrons?

Which of the following best characterizes electrical insulators?

Object A has a charge q on it, object B has a charge q on it, and object C has a charge 2q on it. These charges are arranged, one each, at the vertices of an equilateral triangle. Which charge has the greatest magnitude electric force on it?

Charges q, q, and -q are placed on the x axis at x = 0, x = 2 m, and x = 4 m, respectively. At which of the following points does the electric field have the greatest magnitude?

Five equal negative charges are uniformly spaced in a semicircular arc of radius with its center at the origin. The charges positions in polar coordinates are given by , where the values of are . At the position in the 4th quadrant, which statement best describes the direction of the resulting electric field?

A proton consists of 3 quarks, two with charge +2e/3 and one with charge -e/3. Of the following, which is closest to the approximate potential energy of the arrangement of the two positive quarks if they are separated by 10^-15 m?

A charge, +Q, is placed inside a balloon and the balloon is inflated. As the radius of the balloon r increases the number of field lines going through the surface of the balloon:

If body M, with a positive charge, is used to charge body N by induction, what will be the nature of the charge left on the latter?

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

A ping-pong ball covered with a conducting graphite coating has a mass of 2.5 * 10 ^{- 3} kg and a charge of 4.0 µC. What electric field directed upward will exactly balance the weight of the ball? (g = 9.8 m/s²)

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?

In an electrophoresis experiment, the terminal speed of a particular DNA fragment is v_T . If the experiment is repeated with identical fragments with the voltage between the plates producing the field increased by 50%, what new terminal speed would occur? Choose the closest answer.

Two identical balls have the same amount of charge, but the charge on ball A is positive and the charge on ball B is negative. The balls are placed on a smooth, level, frictionless table whose top is an insulator. Which of the following is true?