things to remember physics e&m

when resistors are parallel, what happens to equivalent resistance?

it decreases because there are more paths for current to travel through

what happens to equivalent resistance for resistors in a series?

it increases

What happens to charge, electric field, and capacitance if the distance between the capacitor plates INCREASE while the battery is still CONNECTED

charge decreases, capacitance decreases, electric field decreases

what happens to charge, electric field, and capacitance if area is DECERASED when the battery is connected

capacitance decreases, charge decreases, electric field remains constant

does changing plate size affect electric field

no

the electric field between the plates of a charged capacitor will____ as long as the charge density ______

not change, does not change

if distance between capacitor plates increases AFTER the battery is disconnected, what happens to potential, electric field, and capacitance?

capaticance decreases, potential increases, electric field remains the same

what happens to potential, electric field, and capacitance if the area increases AFTER the battery is disconnected?

capacitance increases, potential stays the same because charge is removed when area decreases and electric field stays the same

if the battery is disconnected from a capacitor after it is charged, what stays constant when the dimensions are changed

charge density

if the battery stays connected to a capacitor when the dimensions of the capacitor are changed, what stays constant?

potential difference

capacitors in a series(3 things)

current only has one path to travel, current is the same so charge is the same, equivalent capacitance is less than the smallest capacitor, V total equals sum of individual V

parallel capacitors(3 things)

current has multiple paths, potential difference is same across capacitors, equivalent capacitance is the sum of all capacitors, add up charges to find total charge

how to write differential equation

write out loop rule, remember I = C dVc/dt

what is the electric field inside a conductor and why

0 because in conductors, the charges are not fixed so excess charge resides on the surface leaving the inside of the conductor with a net charge of 0 and electric field of 0