Physics D.2 / D.3 Data Booklet Variables

F

Force, measured in newtons (N)

k

Coulomb’s constant, 8.99 × 10^9 N x m ² /C²

q

Electric charge, measured in Coulombs

q1, q2

the two electric charges, measured in C

r

distance between the charges or parallel wires, measured in meters

e0

permittivity of free space

E

electric field strength, measured in N/C or V/m

V

potential difference (voltage), measured in volts (V)

d

distance across a uniform electric field, measured in m

v

velocity of a moving charge, measured in m/s

B

magnetic-field strength, measured in teslas (T)

\(\theta\)

angle between the magnetic field and the charge’s velocity or current

I

electric current, measured in amperes (A)

I1, I2

currents in the two parallel wires, measured in amperes (A)

L

Length of wire in the magnetic field, measured in m

u0

permeability of free space

F/L

force per unit length of wire, measured in N/m