Two electrons (e1 and e2) and an protin (p) lie on a straight line, as shown. The directions of the force of e2 on e1, the force of p on e1, and the total force on e1, respectively, are:

A) $\rightarrow$, $\leftarrow$, $\rightarrow$ B) $\leftarrow$, $\rightarrow$, $\rightarrow$ C) $\rightarrow$, $\leftarrow$, $\leftarrow$ D) $\leftarrow$, $\rightarrow$, $\leftarrow$ E) $\leftarrow$, $\leftarrow$, $\leftarrow$ A) $\rightarrow$, $\leftarrow$, $\rightarrow$ B) $\leftarrow$, $\rightarrow$, $\rightarrow$ C) $\rightarrow$, $\leftarrow$, $\leftarrow$ D) $\leftarrow$, $\rightarrow$, $\leftarrow$ E) $\leftarrow$, $\leftarrow$, $\leftarrow$

The units of 1/4 $\pi$$\varepsilon$0 are:

A) N2/C2 B) N . m/C C) N2 .m2/C2 D) N . m2/C2 E) m2/C2 A) N2/C2 B) N . m/C C) N2 .m2/C2 D) N . m2/C2 E) m2/C2

Exam 21: Electric Charge

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In the Rutherford model of the hydrogen atom, a proton (mass M, charge Q) is the nucleus and an electron (mass m, charge q) moves around the proton in a circle of radius r. Let k denote the Coulomb force constant (1/4 $\pi\\varepsilon$ ₀) and G the universal gravitational constant. The ratio of the electrostatic force to the gravitational force between electron and proton is:

(Multiple Choice)

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Question 21

A charged insulator can be discharged by passing it just above a flame. This is because the flame:

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Question 22

The charge on a glass rod which has been rubbed with silk is called positive:

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Question 23

A particle with charge Q is on the y axis a distance a from the origin and a particle with charge q is on the x axis a distance d from the origin. The value of d for which the x component of the force on the second particle is the greatest is:

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Question 24

The magnitude of the charge on an electron is approximately:

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Question 25

Two small charged objects repel each other with a force F when separated by a distance d. If the charge on each object is reduced to one-fourth of its original value and the distance between them is reduced to d/2 the force becomes:

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Question 26

A kiloampere . hour is a unit of:

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Question 27

Two identical charges, 2.0 m apart, exert forces of magnitude 4.0 N on each other. The value of either charge is:

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Question 28

The diagram shows a pair of heavily charged plastic cubes that attract each other. Cube 3 is a conductor and is uncharged. Which of the following illustrates the forces between cubes1 and 3 and between cubes 2 and 3?

(Multiple Choice)

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Question 29

Two electrons (e₁ and e₂) and an protin (p) lie on a straight line, as shown. The directions of the force of e₂ on e₁, the force of p on e₁, and the total force on e₁, respectively, are:

(Multiple Choice)

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Question 30

Two uncharged metal spheres, L and M, are in contact. A negatively charged rod is brought close to L, but not touching it, as shown. The two spheres are slightly separated and the rod is then withdrawn. As a result:

(Multiple Choice)

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Question 31

The units of 1/4 $\pi$ $\varepsilon$ ₀ are:

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Question 32

A conductor is distinguished from an insulator with the same number of atoms by the number of:

(Multiple Choice)

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Question 33

A small object has charge Q. Charge q is removed from it and placed on a second small object. The two objects are placed 1 m apart. For the force that each object exerts on the other to be a maximum. q should be:

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Question 34

A particle with a charge of 510^-⁶ C and a mass of 20 g moves uniformly with a speed of 7 m/s in a circular orbit around a stationary particle with a charge of -5 10^-⁶ C. The radius of the orbit is:

(Multiple Choice)

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Question 35

A neutral metal ball is suspended by a string. A positively charged insulating rod is placed near the ball, which is observed to be attracted to the rod. This is because:

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Question 36

Two particles A and B have identical charge Q. For a net force of zero to be exerted on a third chargeparticle it must be placed:

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Question 37

Charge is distributed on the surface of a spherical conducting shell. A point particle with charge q is inside. If polarization effects are negligible the electrical force on the particle q is greatest when:

(Multiple Choice)

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Question 38

Two particles, X and Y, are 4 m apart. X has a charge of 2Q and Y has a charge of Q. The force on X to that on Y is:

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Question 39

The diagram shows two pairs of heavily charged plastic cubes. Cubes 1 and 2 attract each and cubes 1 and 3 repel each other.. Which of the following illustrates the forces of cube 2 on 3 and cube 3 on 2?

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Question 40

Showing 21 - 40 of 45

Exam 21: Electric Charge

A charged insulator can be discharged by passing it just above a flame. This is because the flame:

The charge on a glass rod which has been rubbed with silk is called positive:

A particle with charge Q is on the y axis a distance a from the origin and a particle with charge q is on the x axis a distance d from the origin. The value of d for which the x component of the force on the second particle is the greatest is:

The magnitude of the charge on an electron is approximately:

Two small charged objects repel each other with a force F when separated by a distance d. If the charge on each object is reduced to one-fourth of its original value and the distance between them is reduced to d/2 the force becomes:

A kiloampere . hour is a unit of:

Two identical charges, 2.0 m apart, exert forces of magnitude 4.0 N on each other. The value of either charge is:

The diagram shows a pair of heavily charged plastic cubes that attract each other. Cube 3 is a conductor and is uncharged. Which of the following illustrates the forces between cubes1 and 3 and between cubes 2 and 3?

Two electrons (e1 and e2) and an protin (p) lie on a straight line, as shown. The directions of the force of e2 on e1, the force of p on e1, and the total force on e1, respectively, are:

Two uncharged metal spheres, L and M, are in contact. A negatively charged rod is brought close to L, but not touching it, as shown. The two spheres are slightly separated and the rod is then withdrawn. As a result:

The units of 1/4 π\piπε\varepsilonε 0 are:

A conductor is distinguished from an insulator with the same number of atoms by the number of:

A small object has charge Q. Charge q is removed from it and placed on a second small object. The two objects are placed 1 m apart. For the force that each object exerts on the other to be a maximum. q should be:

A particle with a charge of 5*10-6 C and a mass of 20 g moves uniformly with a speed of 7 m/s in a circular orbit around a stationary particle with a charge of -5 *10-6 C. The radius of the orbit is:

A neutral metal ball is suspended by a string. A positively charged insulating rod is placed near the ball, which is observed to be attracted to the rod. This is because:

Two particles A and B have identical charge Q. For a net force of zero to be exerted on a third chargeparticle it must be placed:

Charge is distributed on the surface of a spherical conducting shell. A point particle with charge q is inside. If polarization effects are negligible the electrical force on the particle q is greatest when:

Two particles, X and Y, are 4 m apart. X has a charge of 2Q and Y has a charge of Q. The force on X to that on Y is:

The diagram shows two pairs of heavily charged plastic cubes. Cubes 1 and 2 attract each and cubes 1 and 3 repel each other.. Which of the following illustrates the forces of cube 2 on 3 and cube 3 on 2?

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Two electrons (e₁ and e₂) and an protin (p) lie on a straight line, as shown. The directions of the force of e₂ on e₁, the force of p on e₁, and the total force on e₁, respectively, are:

The units of 1/4 $\pi$ $\varepsilon$ ₀ are:

A particle with a charge of 510^-⁶ C and a mass of 20 g moves uniformly with a speed of 7 m/s in a circular orbit around a stationary particle with a charge of -5 10^-⁶ C. The radius of the orbit is: