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Physics 2 Final Exam > Chapter 15 questions > Flashcards

Chapter 15 questions Flashcards

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1
Q

A suspended object A is attracted to a neutral wall. It is also attracted to a positively charged object B. What do we know about the charge of A?

A

It is negatively charged

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2
Q

Object A has a charge of 2 microcoulombs and object B has a charge of 6 microcoulombs. What do we know about the relationship between Fab and Fba?

A

Fab = -Fba

‘equal and opposite’

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3
Q

A test charge of three microcoulombs is at point P where the electric field due to other charges is directed to the right and has a magnitude of 4E6 N/C. If the test charge is replaced with a charge of negative three microcoulombs, what happens to the electric field at point P?

A

the field remains the same

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4
Q

A circular ring of charge of radius b has total charge q uniformly distributed around it. What is the magnitude of the electric field at the center of the ring?

A

ZERO - all charges cancel out

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5
Q

A free electron and a free proton are placed in an identical electrical field. What do we know about their behavior? (2 statements)

A

the magnitude of the acceleration of the electron is greater than that of the proton (F=ma OR a=F/m)

The electric force on the proton is equal in magnitude to the electric force on the electron, but in the opposite direction

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6
Q

What do we know about the magnitude of an electric field based on the field lines?

A

field lines that are close together = stronger electric field
field lines that are farther apart = weaker electric field

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7
Q

Calculate the magnitude of the flux of a constant electric field of 5 N/C in the z direction through a rectangle with area 4m^2 in the xy plane

A

PHI=EAcos(theta)

PHI= 20 Nm^2/C

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8
Q

Calculate the magnitude of the flux of a constant electric field of 5 N/C tilted 60 degrees away from the positive z direction through a rectangle with area 4m^2 in the xy plane

A

PHI = EAcos(theta)

PHI = 10 Nm^2/C

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9
Q

When calculating flux, do positive and negative charges cancel out when tallying them up?

A

YES

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10
Q

For a closed surface through which flux is zero, there are two statements which must be true. What are they?

A

the net charge inside the surface is zero

the number of electric field lines entering the surface is equal to the number that leaves the surface

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11
Q

A glass object receives a positive charge by rubbing it with a silk cloth. In the rubbing process, have protons been added to the object or have electrons been removed from it?

A

electrons have been removed

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12
Q

The fundamental charge is e = 1.60E-19 C. Is it possible to transfer electric charge to an object so its net charge is 9.5 times the fundamental electric charge e?

A

no, charge is quantized

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13
Q

All protons have a charge of +e. True or false?

A

true

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14
Q

True or false? Electrons in a conductor have a charge of -e while electrons in an insulator have no charge.

A

False

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15
Q

The net charge is always zero _____ the surface of an isolated conductor

A

inside

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16
Q

The electric field is always zero ______ a perfect conductor

A

inside

17
Q

The charge density on the surface of an irregularly shaped, isolated, charged conductor is highest where the surface is ______

A

sharpest

18
Q

Two uncharged conducting spheres are separated by distance d. When charge -Q is moved from sphere A to sphere B, the coulomb force has magnitude Fo. Is the coulomb force attractive or repulsive?

A

attractive

19
Q

Two uncharged conducting spheres are separated by distance d. When charge -Q is moved from sphere A to sphere B, the coulomb force has magnitude Fo. If an additional charge -Q is moved from A to B, what is the ratio of the new coulomb force to the original coulomb force Fnew/Fo?

A

4

note F=ke(q1q2/r^2)
q1=+2 and q2=-2

20
Q

Two uncharged conducting spheres are separated by distance d. When charge -Q is moved from sphere A to sphere B, the coulomb force has magnitude Fo. If sphere B is neutralized so it has no net charge, what is the ratio of the new to the original coulomb force Fnew/Fo?

A

0

21
Q

Positive charge Q is located at the center of a hollow, conducting spherical shell. Is induced charge Qinner on the inner surface of the shell positive or negative?

A

negative

22
Q

Positive charge Q is located at the center of a hollow, conducting spherical shell. Is the induced charge Qouter on the outer surface of the shell positive or negative?

A

positive

23
Q

Positive charge Q is located at the center of a hollow, conducting spherical shell. What is the ratio of Qinner/Q?

A

-1

24
Q

Positive charge Q is located at the center of a hollow, conducting spherical shell. What is the ratio of Qouter/Q?

A

1

25
Q

Consider a point located an arbitrary distance between two point charges in otherwise empty space. The point is not located on a field line. Is it possible for an electric field to exist at the point in empty space?

A

Yes

26
Q

Consider a point located an arbitrary distance between two point charges in otherwise empty space. The point is not located on a field line. Does charge exist at that point?

A

No

27
Q

Consider a point located an arbitrary distance between two point charges in otherwise empty space. The point is not located on a field line. Does a force exist at that point?

A

No

28
Q

A spherical surface surrounds a point charge Q. Describe what happens to the total flux through the surface if the following happens. The charge is tripled.

A

The flux is tripled

29
Q

A spherical surface surrounds a point charge Q. Describe what happens to the total flux through the surface if the following happens. The volume of the sphere is doubled.

A

the flux remains constant

30
Q

A spherical surface surrounds a point charge Q. Describe what happens to the total flux through the surface if the following happens. The surface is changed to a cube.

A

the flux remains constant

31
Q

A spherical surface surrounds a point charge Q. Describe what happens to the total flux through the surface if the following happens. The charge is moved to another location inside the surface.

A

The flux remains constant

32
Q

A spherical surface surrounds a point charge Q. Describe what happens to the total flux through the surface if the following happens. The charge is moved outside the surface.

A

The flux goes to zero

33
Q

If more electric field lines leave a gaussian surface than enter it, what can you conclude about the net charge enclosed by the surface?

A

The surface must enclose a positive net charge (field lines go FROM positive charges TO negative charges)

34
Q

What happens when a charged insulator is placed near an uncharged metal object?

A

They attract each other

Physics 2 Final Exam (14 decks)

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