Physics Test 1 Cheat Sheet PDF

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A summary of all the formulas and ways to work through problems....

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Physics 2 Test 1 Cheat Sheet • How many e- are transferred ne- = q/e *e = -1.6e-19 *q in C$ • Magnitude of e force between F = ke • Find the x component $ (2) r2 = √-x22 + -y22 ! (1) r1 = √x12 + -y12 (3) Ex1 = -ke (5) Ex = Ex1 + Ex2 • Electric field runs/points from + to -$ • Fields are stronger depending on the # of field lines around point$ • Ratio of magnitude of charge A to B QA/QB

• Hollow metallic cylindrical shell has no net charge$

• Electric field _ from center Gauss’s Law E = Q/(4πEor2) If # < r then E = 0 If # > r then E = ke If magnitude of electric field inside is given, what is magnitude outside at _ E2 = (R3/r1 • • Distance between particles r = (ke • Change in PE of charge difference = PE charge/electric charge$ • Potential difference between A&B b4 spark ** • Amount of KE gained after movement KEF = eE(xF - xi)$ • KE of proton after acceleration KE = qV$ • Speed of proton after acceleration KE = mv2/2 • How much work to move charge to center W = 2kQq/a$ • Electric potential at point V = (kq1)/rvert + (kq2)/r2 + (kq3)/rhor *r2 = r12+r32

• Potential difference when given charge of capacitor q = CV→ V = q/C • Charge stored Q = FV$ • Double plate separation, charge on plate is halved $

• Ratio of final charge on plate if doubled 1/2 • Equivalent capacitance between y&z C = 1/( 1/C2 + 1/C3 + 1/C4567) + C1 • To get C4567 = 1/( 1/C5 + 1/C6 + 1/C7) + 1/C4$ • Charge on capacitor centered on left Q = FV *turn µF into F by x1e-6$ • Both switches closed, find charge on capacitor *C12 is C1 + C2 (1) 1/( 1/C12 + 1/C34) (2) Q1234 = C1234 (3) Q12 = Q34 = Q1234 (4)V12 = Q12/C12 (5) V1 = V2 = V12 (6) Q1 = C1 • Ratio of C’12/C12 is 2K/(1+K)$ • Ratio of V’2/V2 is 2/(1+K)$ • Ratio of U’/U is 2K/(1+K)$ • Ratio of Qtop to Qbottom is Ktop/Kbottom • Calculate capacitance of the device C’ = 1/( 1/Cleft + 1/Cright then CL = CR = (EoA)/(d/2) • *A = vertical length in m squared (#2) *d is horizontal length in m • Ratio Vleft to Vright is Kright/Kleft

Physics 2 Test 1 Cheat Sheet

• Drift speed of e- vd = I/(nqA) *n = 9e28 *q = e *A = π(d/2)2$ • Resistance of wire after it is stretched R’ = length2 • Current delivered to the motor I = watts/volts • Temp of bath after resistance change $ • Ω2/Ω1 = [1 + temp coeff(T - elementT)]/[1 + temp coeff(Tgiven - elementT)] • Divide Ωs, solve denominator, multiply denom by Ω quotient, subtract 1, divide left by temp coeff, add elementT • Current in a Ω resistor I = volts/Ω$ • Find resistance between points a&b R1234 = 1/(1/R1 + 1/R23 + 1/R4) *2&3 are in middle

• Find I1 (1) D1 = RD (E3 − E1 − E2) − RC (E1 + E2) (2) D = 0 − (RCRD) − (RA + RB) (RD + RC) (3) I1 = D1/D$ • Find I2 (1) D2 = RD(E1 + E2) − RDE3 − [E3 (RA + RB) − 0] (2) I2 = D2/D$ • Find I3 I3 = I1 + I2

C)$

• Equivalent resistance (1) τ = t/ln2

(2) R = τ/C *C in F...