Ch 1 Formulas Flashcards
1
Q
To find force b/w two point charges
A
F=kq1q2/r²
2
Q
Relation b/w F and E
A
F=QE
3
Q
Quantization of charges
A
Q=±ne
4
Q
E.F due to a point charge
A
E=kQ/r²
5
Q
To find electric flux
A
∅=øE→.ds→=Eødscosθ
6
Q
Gauss theorem
A
φ=q/εº
7
Q
E.F due to infinitely long straight wire
A
E=λ/2πεºR
8
Q
EF outside the shell
A
E=kq/r²
9
Q
Inside the shell
A
E=0
10
Q
On the shell
A
E= σ/εº
11
Q
EF due to uniformly charged thin planesheet
A
E= σ/2εº
12
Q
EF due to dipole on axial line
A
E=2kp/r³
13
Q
EF due to dipole on equitorial line
A
E=kp/r³
14
Q
Torque on electric dipole placed in uniform EF
A
τ=pEsinθ
τ→=p→xE→
15
Q
Workdone to rotate the dipole or PE of dipole
A
W=U=-p→.E→
=-pEcosθ
