HT_1_sample_test_2011

HT_1_sample_test_2011 - Department of Physics, Lehigh...

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

View Full Document Right Arrow Icon
1 Department of Physics, Lehigh University Physics 21 Introductory Physics II Spring 2010 Hour Exam I February 16, 2010 Closed Notes 9:20 AM-10:10 AM Student’s Name______________________ Recitation Section Number______________ Recitation Leader’s Name_______________ The test is a multiple-choice examination. First, check to be sure that you have a six-page examination, including the equation sheet. Please answer each question by writing the letter corresponding to your choice in the answer area. Answers marked outside the answer areas will not be scored. Problem 1. Consider three particles with a charge q=0.50 μC on the x-y plane as shown in the figure. The particles are located on the vertices of an equilateral triangle of side a=1.0cm. 1. What is the magnitude of the net force on particle 3? (a) .0044N (b) 0.0039N (c) 39N (d) 45 N Answer:______ 2. Which unit vector bests describes the direction of the net force on particle 3? (a) î + ĵ (b) î (c) ĵ (d) – ĵ Answer:______ 3. What is the magnitude of the electric field at the origin? (a) (b) (c) (d) Answer:______ 4. Which unit vector bests describes the direction of the electric field at the origin? (a) î + ĵ (b) î (c) ĵ (d) – ĵ Answer:______ 5. What would be the total flux through a Gaussian surface that contained these three point charges? a) b) c) d) Answer:______
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 Problem 2. The plane P (shown in the figure edge-on) at x = 0 has a uniform layer of charge, σ = - 2μC/m 2 . Parallel to the plane and a distance s = 10 cm from it there is a long line, L (shown in the figure end-on), with a uniform charge λ = +10μC/m. 1. Consider the electric field due only to the plane P. By symmetry, the direction of the electric field lines is (a) radially inward toward the origin of the coordinate system (b) out from the plane P and parallel to the x axis (c) into the plane P and parallel to the x axis (d) from any point on the plane toward line L . Answer:______ 2.
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.

Page1 / 6

HT_1_sample_test_2011 - Department of Physics, Lehigh...

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