Flashcards in Electromagnetic Induction Deck (18):

1

## Faradays Laws of EMI

###
E= -dδ/dt;

E= emf generated

δ= Magnetic flux

2

## Magnetic flux δ=?

###
δ=NB.A

; A=Area

B= Magnetic field

δ= Magnetic Flux

3

## State Lenz's Law

### EMF generated opposes change in flux

4

## Motional EMF E=?

###
E= Bvl= Bωl²/2=BAf

; f= frequency

l= length of conductor

ω= angular frequency

5

## Induced current I=?

### I= I₀ sin ωt

6

## Coefficient of self induction δ=?

###
δ=LI

E=-L dI/dt

; L= coefficient of self induction

7

## Self induction L of long solenoid =?

###
L= μ₀N²A/l= μ₀ n²Αl

; N= No of turns

n= Turn density

l=length of coil

A= Area of cross section of coil

8

## Self inductance L of toroid =?

###
L= μ₀N²A/2πr

; A= Area of cross section of toroid

9

## Energy E stored in an inductor =?

###
E= 1/2 Li^

; L = Inductance

I= Current

10

## Coefficient of mutual inductance δ=?

###
δ=MI

E=-M dI/dt

; M = coefficient of mutual inductance

11

## In EMI , coefficient of coupling K=?

###
K= M/√L1L2

;L1,L2= Mutual inductance of respective coils

K= coefficient of coupling

12

## Mutual inductance M of long coaxial solenoid =?

###
M= μ₀N1N2A/l

;N1,N2= No of turns on respective solenoids

l= length of solenoid

μ₀= permittivity of free space

13

## Grouping of coils in series of M=0

###
L=L1+L2

; L= Self inductance

14

## Grouping of coils in series if current in coils is in same direction

### L=L1+L2+2M

15

## Grouping of coils in series if current is in opposite direction

### L=L1+L2-2M

16

## Grouping of coils in parallel if current is in same direction in coils

### L=L1L2-M^/L1+L2+2M

17

## Grouping of coils in parallel if current in coils is in opposite direction

### L=L1L2-M^/L1+L2-2M

18