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24 Cards in this Set
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Potential difference across capacitors in a parallel circuit

1. the are the same
2. each is equal to the voltage of the battery 

Energy Stored on a capacitor

Estored = 0.5C(V)^2=0.5 (Q^2)/C=0.5VQ


total capacitance (Ceq) in a parallel circuit

Ceq= C1+C2+... Cn


total capacitance (Ceq) in a series circuit

1/Ceq= 1/C1+1/C2+...1/Cn


total work done in charging a capcitor

W= 0.5QΔV


The Capacitor is connected to an constant emf source and then the dielectric is inserted. The capacitor with dielectric are connected to a constant voltage source.
What are the properites of the capacitor? 
*Voltage remains constant*
1.C = k Co 2.Q = k Qo 3.V = Vo 4.E = Eo 5.U = k Uo 

The Capacitor is charged up by an emf source and then disconnected. The dielectric is then inserted when capacitor is not connected to a voltage source.
What are the properites of the capacitor? 
*Charge is held constant*
1.C = k Co 2.Q = Qo 3.V = Vo /k 4.E = Eo /k 5.U = Uo /k 

Charge across capacitors in a series circuit

1. They are the same
2. the magnitude of the charge must be the same on all the plates 

t/f
The conventional current direction used in circuits is the direction of the electrons 
f
it is the direction of positive charge. 

Total resistance when connected in series

R = R1 + R2 + R3 + R4 + ...


Total resistance when connected in parallel

1/R =1/R1+1/R2+1/R3+1/R4 + ...


Kirchoff's rule regarding conservation of charge

The sum of the currents entering any junction must equal the sum of the currents leaving the junction


Kirchoff's rule regarding conservation of energy

The sum of the potential differences across all the elements around any closed cricuit loop must be zero


Current through resistors in series

1. they are the same because any charge that flows throug hone resistor must flow through the others.
2. It=I1=I2=In 

Potential difference across resistors in series

ΔVt= ΔV1+ΔV2+...ΔVn


Potential difference across resistors in parallel

1. they are the same because each is connected directly across the battery terminals
2.ΔVt=ΔV1=ΔV2=ΔVn 

Current through resistors in parallel

It=I1+I2+In


Equation of magnetic force of charge q moving through a magnetic field

F=qvB sinΘ
where Θ is the angle between v and B 

The right hand rule: for postive or negative charges?

Positive


The left hand rule: for postive or negative charges?

Negative


Magnetic force of a wire length "l" carrying a current I

F=BIL sinΘ


Troque on a currentcarrying loop of wire in a magnetic field B

t=BIA sinΘ
A= crosssectional area 

Radius of the circular path moved by a charge q when perpendicular to B

r=(mv)/qB


Magnetic field, distance r, from a wire carrying a current

B= (μoI)/(2πr)
