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Physics > Current Electricity > Flashcards

Current Electricity Flashcards

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1
Q

The flow of current through a conductor is due to

A

Free electrons

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2
Q

The specific resistance of wire depends upon

A

material

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3
Q

A wire is stretched to double its length, its resistance will be

A

Four times

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4
Q

the unit of specific resistance is

A

Ohm meter

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5
Q

Is copper wire an Ohmic resistance

A

Yes

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6
Q

In Semiconductor on raising temp. what happens to its resistance

A

decreases

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7
Q

the conductance of super conductor is

A

infinite

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8
Q

the e.m.f. of a cell depends upon

A

nature of electrolyte and electrodes

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9
Q

Kirchoff’s first law is in accordance with

A

Law of conservation of charge

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10
Q

the internal resistance of a cell can be decreased by:

A

decreasing the distance between electrodes.

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11
Q

THE PROPERTY WHICH DIFFERENTIATES BETWEEN 2 DIFFERENT KINDS OF CHARGES IS CALLED

A

POLARITY OF CHARGE

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12
Q

WHY GOLD LEAF ELECTROSCOPE IS USED ?

A

TO DETECT CHARGE ON BODY

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13
Q

DEFINE CONDUCTOR

A

THOSE WHICH ALLOWS ELECTRICITY TO PASS THRIUGH THEM EASILY ARE CALLED CONDUCTORS

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14
Q

DEFINE INSULATORS

A

THOSE MATERIALS WHO DONT LET ELECTRICITY PASS THROUGH THEM ARE INSULATORS

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15
Q

DEFINE EARTHING OR GROUNDING

A

THE PROCESS OF SHARING CHARGE TO EARTH IS CALLED EARTHING GROUNDING

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16
Q

IN INDUCTION CHARGING SPHERES ARE

A

EQUALLY AND OPPOSTIVELY CHARGED

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17
Q

NO . OF ELECTRONS IN 1COULONB CHARGE

A

6X10^18

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18
Q

A CUBIC PIECE OF COPPER OF SIDE 1CM CONTAINS ABOUT— ELECTRONS

A

2.5X10^24

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19
Q

COULOMB LAW

A

I DONT THINK I NEED TO WRITE THIS

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20
Q

VALUE OF K AND UNIT

A

9X13^9
NM^2/C^2

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21
Q

VALUE OF PERMITTIVITY OF FREE SPACE

A

E0 = 8.854X10^-12 N-1 M-2

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22
Q

ELECTRIC FILED

A

Qq/
4⊓E0 r^2

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23
Q

SI UNIT OF ELECTRIC FEILD

A

N/C

IT IS A VECTOR QUANTITY

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24
Q

DIRECTION OF ELECTRIC FEILD

A

FOR+VE RADAILLY OUTWARDS
FOR-VE RADAILLY INWARDS

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25
Q

DIRECTION OF ELECTRIC FEILD LINES

A

START FROM +VE AND END AT -VE

26
Q

FIELD OF ELECTRIC DIPOLE

A

FOR POINTS ON AXIS
-VE = E =-QP/4⨅E0(R+A)2
+VE= E = QP/4⨅E0(R-A)2
FOR POINTS ON EQUITORIAL PLANE
E=-P/4⨅E0R3

26
Q

ELECTRIC FLUX

A

∆∅=E∆SCOS⩉

26
Q

SI UNIT OF ELECTRIC FLUX

A

N/CM2

26
Q

P=

A

QX2A

26
Q

DEFINE ELECTRIC DIPOLE

A

AN ELECTRIC DIPOLE IS A PAIR OF EQUAL AND OPPOSITE POINT CHARGES Q AND -Q SEPARTED BY 2a

26
Q

FIELD DUE TO UNIFORMLY CHARGED INFINITE PLANE SHEET

A

E = σ /2 E0

26
Q

TORQUE CU OF UNIFORE ELECTRIC FELID

A

ɽ=q E 2aSIN⩉=pxE

26
Q

FEILD DUE TO UNIFORMLY CHARGED THIN SPHERICAL SHELL

A

OUTSIDE – E = Q/4⨅E0R2
INSIDE – E = 0

26
Q

FEILD DUE TO INFINITELY LONG STRAIGHT WIRE

A

E = ʎ/2⨅E0r

26
Q

DEFINE SURFACE CHARGE DENSITY

A

Suppose q is the charge and a is the area of the surface over which it flows, then the formula of surface charge density is σ = q/A, and the S.I. unit of surface charge density is coulombs per square meter (cm−2).

26
Q

DEFINE LINEAR CHARGE DENSITY

A

Per unit length i.e. linear charge density, where q is the charge and is the length over which it is distributed. The SI unit will be Coulomb (m ^ {-1}).
FORMULA –ʎ=∆Q/∆L

26
Q

DEFINE VOLUME CHARGE DENSITY

A

Per unit volume i.e. volume charge density, where q is the charge and V is the volume of distribution. The SI unit is Coulomb (m ^ {-3}).
FORMULA – P=∆Q/∆V

26
Q

DEFINE GAUSS LAW

A

Gauss’s law for electricity states that the electric flux Φ across any closed surface is proportional to the net electric charge q enclosed by the surface; that is, Φ = q/ε0, where ε0 is the electric permittivity of free space

26
Q

IMPORTANT PROPERTIES OF FEILD LINES ARE

A

1] FIELD LINES ARE CONTINOUS CUVERS WITHOUT ANY BREAKAGE
2] TWO FIELD LINES NEVER INTERSECT E/O
3] THEY START FROM +VE TO-VE
4] THEY DO NOT FORM CLOSED LOOP

27
Q

DEFINE ELECTRIC CURRENT

A

Electric Current is the rate of flow of electrons in a conductor. The SI Unit of electric current is the Ampere.

28
Q

DEFINE INOSPHERE

A

IN NATURE FREE CHARGED PARTICLES DO EXIST LIKE IN UPPER STRATA OF ATMOSPHERE CALLED INOSPHERE

29
Q

WRITE OHM LAW

A

V = I R

30
Q

WRITE FORMULA OF RESISTANCE

A

R = P L / A
P IS RESISTIVTY

31
Q

FORMULA OD CHARGE DENSITY

A

J = I /A
J = σE
σ IS CONDUCTIVITY

32
Q

RELATION B/W CONDUCTIVITY AND RESISTIVITY

A

σ= 1/P

33
Q

DEFINE DRIFT VELOCITY

A

When electrons are subjected to an electric field they do move randomly, but they slowly drift in one direction, in the direction of the electric field applied. The net velocity at which these electrons drift is known as drift velocity.

34
Q

FORMULA OF DRIFT VELOCITY

A

I = n v A Q

35
Q

DEFINE MOBILITY

A

The drift velocity of an electron for a unit electric field is known as the mobility of the electron

⋃= Vd /E

36
Q

RESISTOR COLOUR CODES

A

READ FROM NCERT

37
Q

TEMPTURE DEPANDANCE OF RESISTIVITY

A

ρT= ρ0 [1 + a(T–T0)]

38
Q

FORMULA OF ELECTRICAL ENERGY

A

dK = I Vdt

39
Q

electrical power

A

P = I 2 R = V 2/R = I V

40
Q

RESISTANCE IN PARALLEL

A

Req=1/R1+1/R2….

41
Q

RESISTANCE IN SERIES

A

Req=R1+R2….

42
Q

DEFINE ELECTROMOTIVE FORCE EMF

A

V+ – (–V–) = [V+]+ V–
. This difference is called the
electromotive force (emf) of the cell and is denoted by e.

43
Q

DEFINE INTERNA REISTANCE

A

The electrolyte through which a current flows has a finite
resistance r, called the internal resistance

44
Q

V=

A

= e – I r

45
Q

The maximum current that can be drawn from a cell is for R = 0

A

Imax = e/r

46
Q

REVISE KHRICOOF LAW WHEATSTONE BRIDGE

A

Junction rule: At any junction, the sum of the currents entering
the junction is equal to the sum of currents leaving the junction

Loop rule: The algebraic sum of changes in
potential around any closed loop involving
resistors and cells in the loop is zero

47
Q

CONDITON FOR BALANCE WHEATSTON BRIGDE

A

R1/ = R3/
R2 = R4

48
Q

STUDY METER BRIDGE AND POTENTIOMETER

A

Physics (10 decks)

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