PROBLEM NUMBER 5 PLEASE Logged ( × \' Bb Course 1 × N Phy 232 B Tests &C; Review

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PROBLEM NUMBER 5 PLEASE

Logged ( × ' Bb Course 1 × N Phy 232 B Tests &C; Review T B Review T Review Tx -Review TxYB Review TX e ]Content o Search C×Tc15. For TxT Neymar.x N www w www.nvcc.edu/home/tstantcheva/232files/232_misc/phy232_au09_exam3b.pdf Problem 4. (8 pt) If R-11 , what is the equivalent resistance between points a and b? Ans.6.6 Problem 5.(10 (a) (4 pt) Determine the current through Ri (b) (6 pt) Determine the resistance R3 pt) If I 1.8 A, El = 30 V, E = 50 V, Ri = 10 , and R2 20 , Ans. 1.6 A to the left Ans. 4.12 £2 R3 R1 is stored in an Problem 6. (4pt) What fraction of the initial energy is stored in an initially charged capacitor after it has been discharging for 3 half-life periods Ans. 1.56 %

Explanation / Answer

3) Workdone by the spring = 0.5*k*(x2^2 - x1^2)

= 0.5*80*(0.08^2 - 0.3^2)

= -3.334 J

a) Let I1 is the current through R1

Apply, KVL in right loop in clockwside direction

E1 - E2 + I*R2 + I1*R1 = 0

I1*R1 = E2 - E1 - I*R2

I1 = (E2 - E1 - I*R2)/R1

= (50 - 30 - 1.8*20)/10

= -1.6 A (to the right) <<<<<<<-----------Answer

I3 + 1.6 = 1.8

I3 = 1.8 - 1.6

= 0.2 A (downward)

Apply, KVL in right loop

-I*R2 + E2 - I3*R3 = 0

I3*R3 = E2 - I*R2

R3 = (E2 - I*R2)/I3

= (50 - 1.8*20)/0.2

= 70 ohms <<<<<<<-----------Answer

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