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MCAT: PHYSICS > Electrostatics > Flashcards

Electrostatics Flashcards

1
Q

how do you describe the electric field inside a charged parallel plate capacitor ?

A

Electric field is constant and perpendicular to the plates.

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2
Q

Describe the electric potential in a parallel plate capacitor ?

A

Electric potential increases linearly from the negative to the positive plate.

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3
Q

how do electric field lines point towards charges ?

A

Electric field lines point AWAY from positive charges, Toward negative charges.

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4
Q

what does voltage also signify ?

A

V= Potential Difference

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5
Q

What happens to charge and capacitance with a dielectric between isolated conductors ?

A

The presence of a dielectric between two isolated conductors carrying equal but opposite charges cannot change the magnitude of the separated charge, but it does INCREASES the capacitance.

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6
Q

What is the formula for change in Electric PE ?

A

change PE ^E = q x change in electric potential = qV

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7
Q

What is work done by electric field?

A

W by E = - change in Electric potential energy

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8
Q

What is the elementary charge (smallest possible unit) ?

A

e = 1.6 x 10^-19 C

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9
Q

What is electrostatic Force equation ?

A

FE = K |Q||q|/ r^2

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10
Q

what is value of k (dielectric constant) in electrostatics ?

A

k = 9 X 10^9 N x m ^2/ C^2

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11
Q

What is formula of electric field ?

A

E= Electric force/ charge (q)
E= FE/q

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12
Q

What is electric field from point charge ?

A

E = k |Q|/r^2

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13
Q

What is unit for electric potential ?

A

J/C or (Volt)

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14
Q

What is formula for electric potential form point charge ?

A

electric potential = k Q/r

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15
Q

What is the unit for electric charge?

A

Coulombs

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16
Q

What is unit for electric field ?

A

N/C (or V/m)

17
Q

What is equation for capacitors (conducting surfaces separated by insulator)

A

C= k eo A/d
k : dielectric
Eo : characteristic of insulator
D: distance between surfaces

18
Q

What is the unit for Capacitors?

A

C= Farads

19
Q
A
20
Q

What is formula for charge on capacitor ?

A

Q = CV

21
Q

What is formula for energy stored by capacitor ?

A

PE cap= 1/2 QV= 1/2 CV^2= Q^2/2C

22
Q

What is formula for electric field on a capacitor ?

A

V = Ed

or E= V/d

23
Q

What is conductor ?

A

conductor: material in which charges move freely

24
Q

What happens when you apply potential difference (voltage) to conductor ?

A

apply voltage (potential difference) allows net movement of charge (current)

25
Q

What is a current in conductor ? What is formula and units for current ?

A

Current: flow rate of charge
I = change in Charge/ time
I = Q/t
units Amperes (A) : C/s

26
Q

What is formula for Ohms’ law ?

A

V = IR

27
Q

What is resistivity ?

A

resisitivity: how much a material opposes flow of charge through it

28
Q

What is resistance ?

A

Resistance ; how much an OBJECT opposes flow of charge through it

29
Q

What is formula for Resistance ? what is the unit?

A

R= p (resistivity) L/A
units : ohm

30
Q

What is the Req equation for resistors in series ? What do resistors have in common

A

Req= R1 + R2 + R3….
(req series > R1, R2, R3)
resistors in series have Same CURRENT throughout

31
Q

What is Req equation for resistors in parallel ? What do resistors have in common for parallel ?

A

Req= 1/R1 + 1/R2 + 1/R3

restores in parallel have Same VOLTAGE

32
Q

what happens when you put formulas for electric field and electric potential together ?

A

Electric field : E = k Q/ r^2
electric potenital = k Q/r
hence together = electric potential / r
( kq/r) / (r) = same as kq/r^2

33
Q

what is equation for change in KE for absence of nonconservative forces ?

A

Change in KE= - change in PE

34
Q

What is formula for kinetic energy

A

KE = 1/2mv^2

35
Q

What happens to voltage if two capacitors are in parallel?

A

. if two capacitors are in parallel, and voltages in parallel must be the same)

36
Q

How do you define equilibrium for a capacitor ?

A

Equilibrium is established when the potential difference, or voltage, is the SAME across each capacitor

37
Q

what is another formula used to calculate potential energy for capacitors?

A

PE =1/2QV= Q^2/2C or PE= 1/2CV^2

38
Q
A

MCAT: PHYSICS (6 decks)

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