Practice Exam 3_B - 1 The diagram shows three equally spaced wires that are perpendicular to the page The currents are all equal with#1 and#3 being

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1. The diagram shows three equally spaced wires that are perpendicular to the page. The currents are all equal, with #1 and #3 being out of the page and #2 being into the page. Rank the wires according to the magnitudes of the magnetic forces on them, from least to greatest . A) 3, 2, 1 B) 1, 2, 3 C) 2, 1 and 3 tie D) 2 and 3 tie, then 1 E) 1 and 3 tie, then 2 2. Two long straight wires enter a room through a window. One carries a current of 3.0 A into the room while the other carries a current of 5.0 A out. The magnitude of the path integral B dl G G v in T m around the outer edge of the window is: A) 6.3 × 10 –6 B) 1.0 × 10 –5 C) 3.8 × 10 –6 D) 2.5 × 10 –6 E) none of these 3. In the lecture demonstration shown below we had two solenoids. The solenoid on the right, connected to the ammeter, G, can be fixed at different positions with respect to the solenoid on the left. Which of the following statements is/are correct? 1. There is a current in G just after S is opened or closed. 2. The magnitude of any current in G depends on the relative position of the solenoids 3. The direction of any current in G will always be the same 4. There is a steady deflection (current) in G as long as S is closed 5. The deflection of G can be increased by inserting an iron bar inside the left solenoid A) 2 and 3 B) 2, 4, and 5 C) 1 only D) 1, 2, and 5 E) 1 and 4 Version 1 Page 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4. The primary of a 3:1 step-up transformer is connected to an AC power source and the secondary is connected to a resistor R . The power dissipated by R in this situation is P . If R is connected directly to the source it will dissipate a power of: A) P /3 B) P C) 3 P D) 9 P E) P /9 5. Two very wide conducting sheets carry current into the page in the edge view below. The current in the sheet per meter of horizontal width is λ (in Amps/m). The magnitude and direction of the magnetic field at points P, Q, and R are, respectively: x x x x x x x x x x x x x x x x x x x x x x x x P Q R P Q R A) μ 0 λ up, 0, μ 0 λ down B) 0 μ 0 λ down, 0 C) 0 μ 0 λ right, 0
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/01/2008 for the course PHYSICS 240 taught by Professor Davewinn during the Spring '08 term at University of Michigan.

Page1 / 8

Practice Exam 3_B - 1 The diagram shows three equally spaced wires that are perpendicular to the page The currents are all equal with#1 and#3 being

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online