Physics Notes: Electrostatics & Magnetism

Circuits in series

decreases equivalent capacitance of a circuit

circuits in parallel

sums together to create a large equivalent capacitance

dielectric materials

insulators placed b/w the plates of a capacitor that increase capacitance by a factor equal to the material’s dielectric constant, k

resistivity and length of resistor is ______ to resistance

directly proportional

cross sectional area is _____ proportional to _____

inversely; resistance

conductivity

intensive property and inversely proportional to resistance

anmeters

inserted in SERIES in a circuit to measure current; 0 resistance

voltmeters

inserted in PARALLEL in a circuit to measure a voltage drop; have LARGE resistances

ohnmeters

inserted around a resistive element to measure resistance; they are self-powered and have 0 resistance

capacitance is ___ proportional to ______ and inversely proportional to _____

directly; capacitor plate area; the distance b/w plates

for resistors in parallel, _______ across each resistor is____

voltage drop; identical

for resistors in series, the _____ passing through each resistor is ____

current; identical

charged particles do not _______

intrinsically generate magnetic fields

the direction of the magnetic force on a positron traveling inside the magnetic field of an MRI scanner is ________ to the ______

perpendicular; magnetic field

Magnetic force is directly proportional to and perpendicular

velocity and size of magnetic field

A force applied perpendicular to the direction of the ______ does ___ work on the object

perpendicular; zero

Lorentz force on an electron traveling through the magnetic field of an MRI scanner is _____

0 no matter any changes in the strength of the B magnetic field

the power dissipated in a circuit is __________

the product of current and voltage

in a parallel circuit, the branch with the _______ resistance has the _______ current and the largest power dissipation

lowest; largest

since current is inversely proportional to resistance, if the voltage is fixed, reducing the resistance by half

will double the current