f=1/4πε e=1/4πε f=1/4πε
f=1/4πε
phys 242 block 1, part 1, notes sections 21.1 to 21.7 objects may have a property calledelectric charge(usually just calledcharge) (term 1). the si unit of electric charge is 1 coulomb = 1 c. (electric ) current is the motion of (electric) charge (term 2). the si unit of electric current is 1 ampere = 1 amp = 1 a. then 1 c≡ 1 a·s (≡ is the mathematical symbol for “is defined to equal”). charge can be either positive (+) or negative (–). particle charge (q) rest mass (m 0 term –19 –31 electron –e = –1.602 × 10 c 9.109 × 10