oldhomewk 10 LEE, BENJAMIN Due: Sep 26 2007, 4:00 am Question 1, chap 26, sect 1. part 1 of 1 10 points A small electrically charged object is suspended by a thread between the vertical plates of a parallel-plate capacitor. The acceleration of grav
homework 19 LEE, BENJAMIN Due: Oct 18 2007, 4:00 am of the solenoid. Question 1, chap 29, sect 5. part 1 of 1 10 points A cross section of a long solenoid that carries current I is shown. I (into the page) r
I
1
Question 2, chap 29, sect 5. part
homework 16 LEE, BENJAMIN Due: Oct 11 2007, 4:00 am Question 1, chap 29, sect 1. part 1 of 1 10 points A positively charged particle moving at 45 angles to both the y-axis and z-axis enters a magnetic field (pointing towards the left-hand side of t
homework 18 LEE, BENJAMIN Due: Oct 16 2007, 4:00 am Question 1, chap 30, sect 1. part 1 of 3 10 points A device ("source") emits a bunch of charged ions (particles) with a range of velocities (see figure). Some of these ions pass through the left s
oldhomewk 13 LEE, BENJAMIN Due: Oct 2 2007, 4:00 am and the total charge is Question 1, chap 27, sect 1. part 1 of 1 10 points How long does it take electrons to get from the car battery to the starting motor? Assume the current is 113 A and the el
homework 11 LEE, BENJAMIN Due: Sep 29 2007, 4:00 am For a capacitor with dielectric , Question 1, chap 26, sect 3. part 1 of 1 10 points A capacitor is constructed from two metal plates. The bottom portion is filled with air and the top portion is
oldhomewk 19 LEE, BENJAMIN Due: Oct 16 2007, 4:00 am Question 1, chap 29, sect 5. part 1 of 2 10 points The wire is carrying a current I. y 180
1
I O
I R
in from , points towards O; i.e., in the xdirection. We need to find d s ^ to use the r B
oldhomewk 18 LEE, BENJAMIN Due: Oct 14 2007, 4:00 am Question 1, chap 30, sect 3. part 1 of 1 10 points What is the maximum torque on a 200-turn circular coil of radius 0.95 cm that carries a current of 1.3 mA and resides in a uniform magnetic fiel
oldhomewk 17 LEE, BENJAMIN Due: Oct 11 2007, 4:00 pm Question 1, chap 29, sect 1. part 1 of 1 10 points A duck flying due north at 65 m/s passes over Atlanta, where the Earth's magnetic field is 7.6 10-5 T in a direction 19 below the horizontal l
oldhomewk 16 LEE, BENJAMIN Due: Oct 9 2007, 4:00 am Question 1, chap 28, sect 8. part 1 of 4 10 points A 154 lamp, a 21 electric heater, and a 45 fan are connected in parallel across a 135 V line. What total current is supplied to the circuit? C
oldhomewk 14 LEE, BENJAMIN Due: Oct 4 2007, 4:00 am Rb = R3 + R4 = 1 + 15 = 16 Question 1, chap 28, sect 7. part 1 of 2 10 points The circuit has been connected as shown in the figure for a "long" time. Ib = It = E 16 V = =1A Rt 16 16 V E = =1A
oldhomewk 12 LEE, BENJAMIN Due: Sep 30 2007, 4:00 am Question 1, chap -1, sect -1. part 1 of 1 10 points Why are thick wires rather than thin wires usually used to carry large current? 1. Thick wires are difficult to break. 2. Thick wires have a la
oldhomewk 09 LEE, BENJAMIN Due: Sep 23 2007, 4:00 am Question 1, chap 26, sect 2. part 1 of 2 10 points Two spherical conductors (shown in the figure below) are separated by a distance large enough to make induction effects negligible. The spheres
homework 17 LEE, BENJAMIN Due: Oct 13 2007, 4:00 am Question 1, chap 30, sect 3. part 1 of 2 10 points A long piece of wire with a mass of 0.327 kg and a total length of 30.248 m is used to make a square coil with a side of 0.398 m. The coil is hin
homework 15 LEE, BENJAMIN Due: Oct 9 2007, 4:00 am Question 1, chap 28, sect 7. part 1 of 3 10 points Consider the circuit shown below, where the capacitor is initially uncharged. R2 R1 V0 C
1
time, then move the switch from "a" to "b". When the
homework 14 LEE, BENJAMIN Due: Oct 6 2007, 4:00 am Question 1, chap 28, sect 4. part 1 of 3 10 points Twelve resistors, each of equal value 75 , are connected so that each is along one edge of a cube, as shown in the figure below. A current of 13.3
homework 13 LEE, BENJAMIN Due: Oct 4 2007, 4:00 am Correct answer: 0.8 V (tolerance 1 %). Question 1, chap 27, sect 4. part 1 of 4 10 points Consider the circuit in the figure. 3 5 8 7 E 0.10 A S Explanation: Let : R3 = 8.0 . V3 = I R3 = (0.1 A)
homework 12 LEE, BENJAMIN Due: Oct 2 2007, 4:00 am Question 1, chap 27, sect 1. part 1 of 1 10 points How long does it take for 14 C of charge to pass through a cross-sectional area of a copper wire if I = 15 A? Correct answer: 0.933333 s (toleranc
homework 10 LEE, BENJAMIN Due: Sep 27 2007, 4:00 am Question 1, chap 26, sect 4. part 1 of 2 10 points A parallel-plate capacitor has a charge of 8.5 C when charged by a potential difference of 2.80 V . a) Find its capacitance. Correct answer: 3.03
homework 09 LEE, BENJAMIN Due: Sep 25 2007, 4:00 am Question 1, chap 26, sect 1. part 1 of 1 10 points Two large parallel conducting plates P and Q are connected to a battery of emf E, as shown. A test charge is placed successively at points I, II,