Electrostatic Potential and Capacitance

Question 1

The SI unit of electrical capacitance

Answer 1

Farad

Question 2

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:

Answer 2

Remains unchanged

Question 3

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

Answer 3

Increases

Question 4

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

Answer 4

Decreases

Question 5

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

Answer 5

Charge

Question 6

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

Answer 6

Potential

Question 7

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

Answer 7

4:1

Question 8

The formula of capacitances of a spherical conductor is:

Answer 8

C=4πε0R

Question 9

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

Answer 9

90

Question 10

1 farad =

Answer 10

one coulomb/volt

Question 11

1 farad = ______stat farad

Answer 11

9 x 10^11

Question 12

Dimensional formula of capacitance is

Answer 12

[M^−1 L^−2 T^4 A^2]

Question 13

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

Answer 13

Capacitor

Question 14

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

Answer 14

Increases

Question 15

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

Answer 15

1 uF

Question 16

The dimensional formula of electric potential is

Answer 16

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

Question 17

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

Answer 17

q x 1 / 4πε0R

Question 18

the potential diff. = Intensity of electric field x ____________

Answer 18

Distance b/w the two points

Question 19

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

Answer 19

qV

Question 20

Due to presence of a dielectric medium the potential

Answer 20

Decreases

Question 21

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

Answer 21

Zero

Question 22

The potential of Earth is considered to be

Answer 22

Zero

Question 23

Formula of capacitance of parallel plate capacitor

Answer 23

ε0A / d

Question 24

Intensity of electric field inside a hollow conductor =

Answer 24

0

Question 25

What is net charge on a charged capacitor

Answer 25

Zero

Question 26

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

Answer 26

In the equatorial position

Question 27

When should the capacitors be connected in series ?

Answer 27

When a high potential is to be distributed to several capacitors

Question 28

When should be the capacitors connected in parallel ?

Answer 28

When capacitance is to be increased

Question 29

What is the effect of insulated medium on the potential ?

Answer 29

The potential of the conductor decreases

Question 30

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

Answer 30

Yes, inside the charged hollow conductor.

Question 31

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

Answer 31

WRe=∫RPFex⋅dr=−∫RPFext⋅dr

Question 32

DEFINR ELECTROSTATICS POTENIAL

Answer 32

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

Question 33

UNIT OF ELECTRIC POTENTIAL

Answer 33

volt ML2T3I-1

Question 34

POTENTIAL DUE TO POINT CHARGE

Answer 34

V = Q/ 4PI EO R

Question 35

DEFINE EQUIPOTENTIAL SURFACE

Answer 35

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

Question 36

RELATION BETWEEN FIELD AND POTENTIAL

Answer 36

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

Question 37

POTENTIAL ENERGY OF Q AT R IN AN EXTERNAL FIELD

Answer 37

QVR

Question 37

INSIDE CONDUCTOR ELECTROSTATICS FIELD IS

Answer 37

0

Question 38

AT SURFACE OF CHARGED CONDUCTOR ELECTROSTATICS FIELD MUST BE

Answer 38

NORMAL TO THE SURFACE AT EVERY POINT

Question 39

ELECTRIC FIELD AT THE SURFACE OF CHARGED CONDUCTOR

Answer 39

E=σε0ˆn.

Question 40

ELECTROSTATIC SHEILDING

Answer 40

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

Question 41

CURRENT PASSES ONLY WHE THERE IS CHANGE IN ---

Answer 41

POTENTIAL

Question 42

DEFINE DIELECTRICS

Answer 42

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.

Question 43

TYPE OF DIELECTRIC MATERIALS

Answer 43

1] POLAR MOLECULES 2] NON POLAR MOLECULES

Question 44

DEFINE POLAR MOLECULES

Answer 44

PERMANENT ELECTRIC DIPOLE ITS POLARZIATION IS TEMP DEPANDENTED

Question 45

NON POLAR MOLECULES

Answer 45

INDUCED ELECRTIC DIPOLE ITS POLARSTATION IS INDEPENTED OF TEMP

Question 46

DEFINE POLARIZATION

Answer 46

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.

Question 47

DEIFNE LINEAR ISOTROPIC DIELECTRICS

Answer 47

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

Question 48

P [ POLARISATION ]

Answer 48

P = Xe E

Question 49

DEFINE Xe

Answer 49

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

Question 50

CAPACTIANCE

Answer 50

C = Q/V = EO A/ d

Question 51

EFFECT OD DIELECTRIC ON CAPATCIANCE

Answer 51

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

Question 52

CAPACITOR I SERIES

Answer 52

1/C= 1/C1+1/C2....

Question 53

CAPACITOR IN PARALLEL

Answer 53

C= C1+C2+C3.....

Question 54

ENERGY STORED IN CAPACITOR

Answer 54

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

Question 55

FORMULA OF U FOR CAPACITOR

Answer 55

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