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MCAT > Physics: E & M > Flashcards

Physics: E & M Flashcards

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MCAT flashcards
1
Q

Conductors

A

Silver, Copper, Aluminum, Iron, Mercury, Carbon, Water

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2
Q

Conductors

A

Silver, Copper, Aluminum, Iron, Mercury, Carbon, Water

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3
Q

Semiconductors

A

Germanium, Silicon

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4
Q

Insulators

A

Dry Air, Wood, Glass, Rubber

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5
Q

A positive charge is deposited on the left side of a metal sphere. Why does the positive charge distribute itself uniformly throughout the surface of the sphere?

A

Excess electrons from the rest of sphere are attracted to the excess protons

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6
Q

A rubber balloon possesses a positive charge. If brought near and touched to a wooden door, it sticks to the door. This does not occur with an uncharged balloon. The wooden door must be

a) electrically neutral
b) negatively charged
c) a conductor
d) lacking electrons

A

a) electrically neutral

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7
Q

Coulomb’s Law

A

F=kQq/r^2

see application of inverse square

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8
Q

Following Coulomb’s Law,

If force is decreased by a factor of 4. What happens to distance?

A

Increased by a factor of 2

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9
Q

Following Coulomb’s Law,

If force is increased by a factor of 9. What happens to distance?

A

Decreased by a factor of 3

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10
Q

Following Coulomb’s Law,

If distance is decreased by a factor of 10. What happens to force?

A

increased by a factor of 100

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11
Q

Following Coulomb’s Law,

If distance is increased by a factor of 5. What happens to force?

A

decreased by a factor of 25

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12
Q

What is true of the electrical potential energy (E) if charges are opposite?

A

E < 0

E is proportional to -1/r

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13
Q

What is true of the electrical potential energy (E) if charges are opposite?

A

E > 0

E is proportional to 1/r

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14
Q

Electric Potential
Conceptual Review:

(Volt = J/C)

A

•• A charge Q produces an E and V around it uniformly
(E and V lines are perpendicular). •

• The magnitude of E and V decrease as distance from Q increases.

•• The magnitude of E and V produced by Q increases as
Q increases. •

• An electric force exists only if a second charge is
placed in the electric field of Q. •

• A system has electrical potential energy only if a
second charge is present.

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15
Q

What physics concepts
appliy the inverse square law
ie: X = 1/r^2

A

Force of Gravity
Force of Electrostatics
Intensity: power/area
I is proportional to 1/r^2

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16
Q

How do you change the energy of a wave

A

interference (constructive/destructive)

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17
Q

Units of spring constant k

A

N/m

18
Q

Electric field (N/C)

A

E= F/q = (kQq/r^2)/q
E=kO/r^2

vector: curved lines that never intersect

19
Q

Why can’t lines criss-cross in an electric field?

A

Cannot have 2 possible directions in one point in space

20
Q

What does low density (spread out lines) in an electric field line

A

shows Weak field

Happens on outer part of field, bc E decreases as r increases (per inverse square law)

21
Q

What can you tell about the spread and direction of arrows pointing in a field?

(Slide 10)

A

Negative charges point IN
Positive point out

MOre lines means higher density, means absolute value of Q is greater than a Q of few / more spread out lines

22
Q

Potential Energy

A

F x d = kQq/r^2 x r = kQq/r

23
Q

Semiconductors

A

Germanium, Silicon

24
Q

Insulators

A

Dry Air, Wood, Glass, Rubber

25
Q

A positive charge is deposited on the left side of a metal sphere. Why does the positive charge distribute itself uniformly throughout the surface of the sphere?

A

Excess electrons from the rest of sphere are attracted to the excess protons

26
Q

A rubber balloon possesses a positive charge. If brought near and touched to a wooden door, it sticks to the door. This does not occur with an uncharged balloon. The wooden door must be

a) electrically neutral
b) negatively charged
c) a conductor
d) lacking electrons

A

a) electrically neutral

27
Q

Coulomb’s Law

A

F=kQq/r^2

see application of inverse square

28
Q

Following Coulomb’s Law,

If force is decreased by a factor of 4. What happens to distance?

A

Increased by a factor of 2

29
Q

Following Coulomb’s Law,

If force is increased by a factor of 9. What happens to distance?

A

Decreased by a factor of 3

30
Q

Following Coulomb’s Law,

If distance is decreased by a factor of 10. What happens to force?

A

increased by a factor of 100

31
Q

Following Coulomb’s Law,

If distance is increased by a factor of 5. What happens to force?

A

decreased by a factor of 25

32
Q

What is true of the electrical potential energy (E) if charges are opposite?

A

E < 0

E is proportional to -1/r

33
Q

What is true of the electrical potential energy (E) if charges are opposite?

A

E > 0

E is proportional to 1/r

34
Q

Electric Potential
Conceptual Review:

(Volt = J/C)

A

•• A charge Q produces an E and V around it uniformly
(E and V lines are perpendicular). •

• The magnitude of E and V decrease as distance from Q increases.

•• The magnitude of E and V produced by Q increases as
Q increases. •

• An electric force exists only if a second charge is
placed in the electric field of Q. •

• A system has electrical potential energy only if a
second charge is present.

35
Q

What physics concepts
appliy the inverse square law
ie: X = 1/r^2

A

Force of Gravity
Force of Electrostatics
Intensity: power/area
I is proportional to 1/r^2

36
Q

How do you change the energy of a wave

A

interference (constructive/destructive)

37
Q

Units of spring constant k

A

N/m

38
Q

Electric field (N/C)

A

E= F/q = (kQq/r^2)/q
E=kO/r^2

vector: curved lines that never intersect

39
Q

Why can’t lines criss-cross in an electric field?

A

Cannot have 2 possible directions in one point in space

40
Q

What does low density (spread out lines) in an electric field line

A

shows Weak field

Happens on outer part of field, bc E decreases as r increases (per inverse square law)

41
Q

What can you tell about the spread and direction of arrows pointing in a field?

(Slide 10)

A

Negative charges point IN
Positive point out

MOre lines means higher density, means absolute value of Q is greater than a Q of few / more spread out lines

42
Q

Potential Energy

A

F x d = kQq/r^2 x r = kQq/r

MCAT (24 decks)

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