A helium nucleus is located between the plates of a parallel-plate capacitor as shown.The nucleus has a charge of +2e and a mass of 6.6 × 10-27 kg.What is the magnitude of the electric field such that the electric force exactly balances the weight of the helium nucleus so that it remains stationary?

A) 4.0 × 10-7 N/C B) 6.6 × 10-26 N/C C) 2.0 × 10-7 N/C D) 5.0 × 10-3 N/C E) 1.4 × 10-8 N/C A) 4.0 × 10-7 N/C B) 6.6 × 10-26 N/C C) 2.0 × 10-7 N/C D) 5.0 × 10-3 N/C E) 1.4 × 10-8 N/C

18-3 The figure shows a parallel plate capacitor.The surface charge density on each plate is 8.8 × 10S1U1P1-S1S1P0S1U1P18S1S1P0 C/mS1U1P12S1S1P0.The point P is located 1.0 × 10S1U1P1-S1S1P0S1U1P15S1S1P0 m away from the positive plate. -Which one of the following statements concerning the direction of the electric field between the plates is true?

A) It points to the left. B) It points to the right. C) It points toward the negative plate. D) It points toward the positive plate. E) It points up out of the plane of the page. A) It points to the left. B) It points to the right. C) It points toward the negative plate. D) It points toward the positive plate. E) It points up out of the plane of the page.

Exam 18: Electric Forces and Electric Fields

18-4 Two point charges, A and B, lie along a line separated by a distance L.The point x is the midpoint of their separation. -Which combination of charges would yield the greatest repulsive force between the charges?

Free

(Multiple Choice)

4.8/5

(35)

Question 1

Correct Answer:

Verified

Complete the following statement: When a glass rod is rubbed with silk cloth, the rod becomes positively charged as

Free

(Multiple Choice)

4.8/5

(35)

Question 2

Correct Answer:

Verified

In the figure, point A is a distance L away from a point charge Q.Point B is a distance 4L away from Q.What is the ratio of the electric field at B to that at A, E_B/E_A?

Free

(Multiple Choice)

4.9/5

(35)

Question 3

Correct Answer:

Verified

Consider three identical metal spheres, A, B, and C.Sphere A carries a charge of -2.0 µC; sphere B carries a charge of -6.0 µC; and sphere C carries a charge of +4.0 µC.Spheres A and B are touched together and then separated.Spheres B and C are then touched and separated.Does sphere C end up with an excess or a deficiency of electrons and how many electrons is it?

(Multiple Choice)

4.8/5

(41)

Question 4

A solid, conducting sphere of radius a carries an excess charge of +6 µC.This sphere is located at the center of a hollow, conducting sphere with an inner radius of b and an outer radius of c as shown.The hollow sphere also carries a total excess charge of +6 µC. -Determine the excess charge on the outer surface of the outer sphere (a distance c from the center of the system).

(Multiple Choice)

4.9/5

(39)

Question 5

A helium nucleus is located between the plates of a parallel-plate capacitor as shown.The nucleus has a charge of +2e and a mass of 6.6 × 10^-²⁷kg.What is the magnitude of the electric field such that the electric force exactly balances the weight of the helium nucleus so that it remains stationary?

(Multiple Choice)

4.7/5

(33)

Question 6

18-4 Two point charges, A and B, lie along a line separated by a distance L.The point x is the midpoint of their separation. -Which combination of charges will yield zero electric field at the point x?

(Multiple Choice)

4.8/5

(22)

Question 7

What is the magnitude of the electric field at the point P?

(Multiple Choice)

4.7/5

(29)

Question 8

A rigid electric dipole is free to move in the electric field represented in the figure.Which one of the following phrases most accurately describes the initial motion of the dipole if it is released from rest in the position shown?

(Multiple Choice)

4.8/5

(32)

Question 9

Two particles of the same mass carry charges +3Q and -2Q, respectively.They are shot into a region that contains a uniform electric field as shown.The particles have the same initial velocities in the positive x direction.The lines, numbered 1 through 5, indicate possible paths for the particles.If the electric field points in the negative y direction, what will be the resulting paths for these particles?

(Multiple Choice)

4.7/5

(35)

Question 10

The magnitude of the electric field at a distance of two meters from a negative point charge is E.What is the magnitude of the electric field at the same location if the magnitude of the charge is doubled?

(Multiple Choice)

5.0/5

(36)

Question 11

Two uncharged, conducting spheres, A and B, are held at rest on insulating stands and are in contact.A positively charged rod is brought near sphere A as suggested in the figure.While the rod is in place, someone moves sphere B away from A.How will the spheres be charged, if at all?

(Multiple Choice)

4.9/5

(26)

Question 12

At what separation will two charges, each of magnitude 6.0 $\mu$ C, exert a force of 0.70 N on each other?

(Multiple Choice)

4.8/5

(28)

Question 13

A straight, copper wire has a length of 0.50 m and an excess charge of -1.0 × 10^-⁵C distributed uniformly along its length.Find the magnitude of the electric field at a point located 7.5 × 10^-³ m from the midpoint of the wire.

(Multiple Choice)

4.9/5

(39)

Question 14

The figure shows the electric field lines in the vicinity of two point charges.Which one of the following statements concerning this situation is true?

(Multiple Choice)

4.8/5

(37)

Question 15

Complete the following statement: When an ebonite rod is rubbed with animal fur, the rod becomes negatively charged as

(Multiple Choice)

5.0/5

(36)

Question 16

If a +2.0 × 10^-⁵ C point charge is placed at P, what is the force exerted on it?

(Multiple Choice)

4.8/5

(37)

Question 17

18-3 The figure shows a parallel plate capacitor.The surface charge density on each plate is 8.8 × 10^-⁸ C/m².The point P is located 1.0 × 10^-⁵ m away from the positive plate. -Which one of the following statements concerning the direction of the electric field between the plates is true?

(Multiple Choice)

4.9/5

(41)

Question 18

Which one of the following statements is true concerning the electrostatic charge on a conductor?

(Multiple Choice)

4.8/5

(39)

Question 19

Which one of the following statements is true concerning the strength of the electric field between two oppositely charged parallel plates?

(Multiple Choice)

4.8/5

(44)

Question 20

Showing 1 - 20 of 61

Exam 18: Electric Forces and Electric Fields

18-4 Two point charges, A and B, lie along a line separated by a distance L.The point x is the midpoint of their separation. -Which combination of charges would yield the greatest repulsive force between the charges?

Complete the following statement: When a glass rod is rubbed with silk cloth, the rod becomes positively charged as

In the figure, point A is a distance L away from a point charge Q.Point B is a distance 4L away from Q.What is the ratio of the electric field at B to that at A, EB/EA?

18-4 Two point charges, A and B, lie along a line separated by a distance L.The point x is the midpoint of their separation. -Which combination of charges will yield zero electric field at the point x?

What is the magnitude of the electric field at the point P?

A rigid electric dipole is free to move in the electric field represented in the figure.Which one of the following phrases most accurately describes the initial motion of the dipole if it is released from rest in the position shown?

The magnitude of the electric field at a distance of two meters from a negative point charge is E.What is the magnitude of the electric field at the same location if the magnitude of the charge is doubled?

Two uncharged, conducting spheres, A and B, are held at rest on insulating stands and are in contact.A positively charged rod is brought near sphere A as suggested in the figure.While the rod is in place, someone moves sphere B away from A.How will the spheres be charged, if at all?

At what separation will two charges, each of magnitude 6.0 μ\muμ C, exert a force of 0.70 N on each other?

A straight, copper wire has a length of 0.50 m and an excess charge of -1.0 × 10-5 C distributed uniformly along its length.Find the magnitude of the electric field at a point located 7.5 × 10-3 m from the midpoint of the wire.

The figure shows the electric field lines in the vicinity of two point charges.Which one of the following statements concerning this situation is true?

Complete the following statement: When an ebonite rod is rubbed with animal fur, the rod becomes negatively charged as

If a +2.0 × 10-5 C point charge is placed at P, what is the force exerted on it?

18-3 The figure shows a parallel plate capacitor.The surface charge density on each plate is 8.8 × 10-8 C/m2.The point P is located 1.0 × 10-5 m away from the positive plate. -Which one of the following statements concerning the direction of the electric field between the plates is true?

Which one of the following statements is true concerning the electrostatic charge on a conductor?

Which one of the following statements is true concerning the strength of the electric field between two oppositely charged parallel plates?

Introduction and Mathematical Concepts

Kinematics in One Dimension

Kinematics in Two Dimensions

Forces and Newtons Laws of Motion

Dynamics of Uniform Circular Motion

Work and Energy

Impulse and Momentum

Rotational Kinematics

Rotational Dynamics

Simple Harmonic Motion and Elasticity

Fluids

Temperature and Heat

The Transfer of Heat

The Ideal Gas Law and Kinetic Theory

Thermodynamics

Waves and Sound

The Principle of Linear Superposition and Interference Phenomena

Electric Potential Energy and the Electric Potential

Electric Circuits

Magnetic Forces and Magnetic Fields

Electromagnetic Induction

Alternating Current Circuits

Electromagnetic Waves

The Reflection of Light: Mirrors

The Refraction of Light: Lenses and Optical Instruments

Interference and the Wave Nature of Light

Special Relativity

Particles and Waves

The Nature of the Atom

Nuclear Physics and Radioactivity

Ionizing Radiation, Nuclear Energy, and Elementary Particles

Filters

In the figure, point A is a distance L away from a point charge Q.Point B is a distance 4L away from Q.What is the ratio of the electric field at B to that at A, E_B/E_A?

At what separation will two charges, each of magnitude 6.0 $\mu$ C, exert a force of 0.70 N on each other?

A straight, copper wire has a length of 0.50 m and an excess charge of -1.0 × 10^-⁵C distributed uniformly along its length.Find the magnitude of the electric field at a point located 7.5 × 10^-³ m from the midpoint of the wire.

If a +2.0 × 10^-⁵ C point charge is placed at P, what is the force exerted on it?

18-3 The figure shows a parallel plate capacitor.The surface charge density on each plate is 8.8 × 10^-⁸ C/m².The point P is located 1.0 × 10^-⁵ m away from the positive plate. -Which one of the following statements concerning the direction of the electric field between the plates is true?