Important Equations Physics Part 2

Question 1

Coulomb’s Law

Answer 1

F = (kq₁q₂)/r²

K=Coulomb’s constant (9X10^9 N(M2)*C^-2)

Question 2

electric field equation

Answer 2

E = electric force/charge

E=k*Q/r²

Question 3

electric potential energy

Answer 3

U = qV

Question 4

voltage equation

Answer 4

voltage = work/charge = (kQ)/r

V=IR

Question 5

current - circuits

Answer 5

I = Q/∆t

Question 6

Ohm’s Law

Answer 6

voltage = current x resistance

Question 7

resistance equation

Answer 7

R = (resistivity x (length)/cross sectional area

CHECK THIS

Question 8

resistance - series circuits

Answer 8

R = R₁+R₂+R₃

Question 9

resistance - parallel circuits

Answer 9

1/R = (1/R₁) + (1/R₂) + (1/R₃)

Question 10

voltage - series circuits

Answer 10

V = V₁ + V₂ + V₃

Question 11

voltage - parallel circuits

Answer 11

V = V₁ = V₂ = V₃

Question 12

current - series circuits

Answer 12

I = I₁ = I₂ = I₃

Question 13

current - parallel circuits

Answer 13

I = I₁ + I₂ + I₃

Question 14

Power - circuits

Answer 14

P = current x voltage = voltage²/resistance = current²/resistance

Question 15

capacitance - circuits

Answer 15

C = charge/voltage

Question 16

energy stored by capacitors

Answer 16

U = (1/2)(charge)(voltage) = (1/2)(capacitance)(voltage²) = (1/2)(charge²/capacitance)

Question 17

Force of medium on charge

Answer 17

F(medium)=F(vacuum)/K

or

F(medium)= K (l q1 q2 l )/(K r^2)

K=dielectric constant

Question 18

Magnetic Force

Answer 18

F(magnetic)=qvB(perpendicular)

v=velocity

Question 19

right hand rule

Answer 19

1. thumb in direction of the velocity
2. fingers in direction of magnetic field vectors
3. where your palm faces is where the force will pint

Question 20

Mass spec turn radius equation

Answer 20

r=mv/qB

Question 21

Electric potential energy of a system

Answer 21

Change in potential energy =kq1q2(1/rf - 1/ri)