## PHYS208 Fundamentals of Physics II

### 1.

a) rms current: 5.63 A

b) power supplied by emf to R: 318 W

c) What value of capacitance should be added to maximize the power transferred to the motor? 176 microF

d) rms current: 8.00 A

e) power supplied by emf to R: 640 W

### 2.

c) Evaluate numerically the quantity ( / )1/2. 377 ohm

f) Evaluate numerically the characteristic impedance for RG58/U coax cable. 51.0 ohm

### 3.

b) For a = 0.50 mm, d = 8.0 mm, and kappa = 2.25, evaluate C0. 23 pF/m

### 4.

a) What is the emf of battery 1? 21.3 V

b) What is the terminal voltage of battery 2? 8.89 V

c) What is the power dissipated by the 12 ohm resistor? 14.8 W

d) What is the power supplied by the emf of battery 1? 42.6 W

### 5.

a) Determine the initial current. 3.0 mA

b) Determine the charge Qmax on the capacitor when it is fully charged. 30 nC

c) Find the time required for the charge on the capacitor to reach 99% of Qmax. 46 microsec

d) Find the time required for the energy stored in the capacitor to reach 99% of its final value. 53 microsec

### 8.

 60 Hz 50 Hz omega 377 rad/s 314 rad/s R 10 ohm 10 ohm XL 50.1 ohm 41.8 ohm Xc 26.5 ohm 31.8 ohm Z 25.6 ohm 14.1 ohm Irms 4.69 A 8.51 A VC,rms 124 V 271 V

"http://www.physics.udel.edu/~watson/phys208/exams/questions-ans.html"
Last updated Dec. 15, 1997.
Copyright George Watson, Univ. of Delaware, 1997.