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Physics > Electrostatic Potential and Capacitance > Flashcards

Electrostatic Potential and Capacitance Flashcards

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1
Q

The SI unit of electrical capacitance

A

Farad

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2
Q

The potential between the plates of a capacitor is constant. A dielectric medium is filled instead of air in between the plates. The intensity of electric field will:

A

Remains unchanged

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3
Q

On replacing the air by an insulating material between the plates of a capacitor its capacity:

A

Increases

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4
Q

On increasing the separation between the plates of a parallel plate capacitor its capacitance:

A

Decreases

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5
Q

When two capacitors are joined in series each capacitor will have the same:

A

Charge

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6
Q

When two capacitors are joined in parallel each capacitor will have the same

A

Potential

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7
Q

Two capacitors of equal capacitance first connected in parallel then connected in series. What is the ratio of their capacities in both the cases:

A

4:1

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8
Q

The formula of capacitances of a spherical conductor is:

A

C=4πε0R

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9
Q

The angles between equipotential surface and electric lines of force is:

A

90

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10
Q

1 farad =

A

one coulomb/volt

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11
Q

1 farad = ______stat farad

A

9 x 10^11

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12
Q

Dimensional formula of capacitance is

A

[M^−1 L^−2 T^4 A^2]

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13
Q

______ is a device in which changing the shape or size of a conductor its capacitance can be increased.

A

Capacitor

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14
Q

On increasing the distance between the plates of a parallel plate capacitor its capacity

A

Increases

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15
Q

three capacitor each of 3 uF are joined in series there equivalent capacitance will be

A

1 uF

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16
Q

The dimensional formula of electric potential is

A

M L^2 T^-3 A^-3

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17
Q

The potential due to a point charge q at a distance r is given by

A

q x 1 / 4πε0R

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18
Q

the potential diff. = Intensity of electric field x ____________

A

Distance b/w the two points

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19
Q

The increase in kinetic energy of a charge “q” when it is accelerated by a potential diff. V is

A

qV

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20
Q

Due to presence of a dielectric medium the potential

A

Decreases

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21
Q

The work done in moving a charge perpendicular to the electric field is

A

Zero

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22
Q

The potential of Earth is considered to be

A

Zero

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23
Q

Formula of capacitance of parallel plate capacitor

A

ε0A / d

24
Q

Intensity of electric field inside a hollow conductor =

A

0

25
Q

What is net charge on a charged capacitor

A

Zero

26
Q

At which position of the dipole , the electric potential die to is will be zero ?

A

In the equatorial position

27
Q

When should the capacitors be connected in series ?

A

When a high potential is to be distributed to several capacitors

28
Q

When should be the capacitors connected in parallel ?

A

When capacitance is to be increased

29
Q

What is the effect of insulated medium on the potential ?

A

The potential of the conductor decreases

30
Q

is it possible that at any point the intensity of electric field is zero but potential does not .

A

Yes, inside the charged hollow conductor.

31
Q

WORK DONE BY EXTERNAL FORCE IN MOVING CHARGE FROM R TO P

A

WRe=∫RPFex⋅dr=−∫RPFext⋅dr

32
Q

DEFINR ELECTROSTATICS POTENIAL

A

The electrostatic potential, also known as the electric field potential, electric potential, or potential drop is defined as

The amount of work done to move a unit charge from a reference point to a specific point inside the field without producing an acceleration.UNI

33
Q

UNIT OF ELECTRIC POTENTIAL

A

volt
ML2T3I-1

34
Q

POTENTIAL DUE TO POINT CHARGE

A

V = Q/ 4PI EO R

35
Q

DEFINE EQUIPOTENTIAL SURFACE

A

The surface, the locus of all points at the same potential, is known as the equipotential surface

36
Q

RELATION BETWEEN FIELD AND POTENTIAL

A

“Electric field is the negative space derivative of electric potential.”
E = -dV/dX

37
Q

POTENTIAL ENERGY OF Q AT R IN AN EXTERNAL FIELD

A

QVR

37
Q

INSIDE CONDUCTOR ELECTROSTATICS FIELD IS

A

0

38
Q

AT SURFACE OF CHARGED CONDUCTOR ELECTROSTATICS FIELD MUST BE

A

NORMAL TO THE SURFACE AT EVERY POINT

39
Q

ELECTRIC FIELD AT THE SURFACE OF CHARGED CONDUCTOR

A

E=σε0ˆn.

40
Q

ELECTROSTATIC SHEILDING

A

THE FIELD INSIDE CAVITY IS ZERO THIS IS KNOWN AS ELECTROSTATIC SHEILDING

41
Q

CURRENT PASSES ONLY WHE THERE IS CHANGE IN —

A

POTENTIAL

42
Q

DEFINE DIELECTRICS

A

DIELECTRICS ARE NON CONDUCTING SUBSTANCE
Dielectrics, in general, can be described as materials that are very poor conductors of electric current. They are basically insulators and contain no free electrons.

43
Q

TYPE OF DIELECTRIC MATERIALS

A

1] POLAR MOLECULES
2] NON POLAR MOLECULES

44
Q

DEFINE POLAR MOLECULES

A

PERMANENT ELECTRIC DIPOLE
ITS POLARZIATION IS TEMP DEPANDENTED

45
Q

NON POLAR MOLECULES

A

INDUCED ELECRTIC DIPOLE
ITS POLARSTATION IS INDEPENTED OF TEMP

46
Q

DEFINE POLARIZATION

A

Polarisation can thus also be thought of as a phenomenon in which an alignment of positive and negative charges takes place within the dielectric, resulting in no net increase in the charge of the dielectric.

47
Q

DEIFNE LINEAR ISOTROPIC DIELECTRICS

A

A linear isotropic dielectric is a dielectric in which the permittivity is a scalar and has equal value at all direction.

48
Q

P [ POLARISATION ]

A

P = Xe E

49
Q

DEFINE Xe

A

Xe IS CONSTANT CHARACTERSTICS OF DIELECTRIC AND IS KNOWN AS ELECTRIC SUSCEPTBITY OF DIELECTRIC MEDIUM

50
Q

CAPACTIANCE

A

C = Q/V = EO A/ d

51
Q

EFFECT OD DIELECTRIC ON CAPATCIANCE

A

Capacitors use non-conducting materials, or dielectrics, to store charge and increase capacitance.

52
Q

CAPACITOR I SERIES

A

1/C= 1/C1+1/C2….

53
Q

CAPACITOR IN PARALLEL

A

C= C1+C2+C3…..

54
Q

ENERGY STORED IN CAPACITOR

A

Energy stored in a capacitor is electrical potential energy,ΔPE = qΔV to a capacitor.

55
Q

FORMULA OF U FOR CAPACITOR

A

1/2QV = 1/2CV2 = 1/2 Q2/C

Physics (10 decks)

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