# P1051W10 - Circle instructor: Yethiraj or Morrow Lab...

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Circle instructor: Yethiraj or Morrow 1 Name:__________________________ Lab period: _____________ Student Number:______________________ MEMORIAL UNIVERSITY OF NEWFOUNDLAND DEPARTMENT OF PHYSICS AND PHYSICAL OCEANOGRAPHY Final Exam Physics 1051 Winter 2010 3:00-5:00 April 15, 2010 INSTRUCTIONS: 1. Do all SIX ( 6) questions in section 1 and all THREE (3) questions in section 2 . Do TWO questions from section 3 . Marks are indicated in the left margin. Section 1 contains 36 marks, Section 2 contains 36 marks, and section 3 contains 28 marks. Budget time accordingly. 2. You may use a calculator. All other aids are prohibited. 3. Write answers neatly in space provided. If necessary, continue onto the back of the page. 4. Do not erase or use “whiteout”. Draw a line neatly through material to be replaced. 5. Assume all information given is accurate to 3 significant figures. 6. Don’t panic. If something isn’t clear, ASK! SEE LAST PAGE FOR SOME POTENTIALLY USEFUL FORMULAE AND CONSTANTS For office use only: 1 2 3 4 5 6 7 8 9 10 11 12 TOTAL

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Circle instructor: Yethiraj or Morrow 2 Name:__________________________ Lab period: _____________ Student Number:______________________ SECTION 1: There are 6 SHORT ANSWER questions. Each is worth 6 marks for a maximum of 36 marks. Budget time accordingly. [6] 1. A scientist on a ship observes that a particular sequence of waves can be described by the function () ( ) ( ) { } [ ] t x t x y m/s 20 . 1 m 628 . 0 sin m 800 . 0 ) , ( 1 = . (a) At what speed do these waves travel? (b) What is the wavelength? (c) What is the period of these waves? [6] 2. A square loop of wire with an area of 9 cm 2 is situated in the x - y plane. A current of 0.75 A circulates counterclockwise through the loop as shown below. A 1.4 T magnetic field is oriented at 60° from the z -axis in the y - z plane. (a) What is the magnetic moment of the loop? Give your answer in unit vector notation. (b) What is the magnitude of the magnetic torque on the loop? I B 60° x y z 3 cm 3 cm
Circle instructor: Yethiraj or Morrow 3 Name:__________________________ Lab period: _____________ Student Number:______________________ [6] 3. A charge of C 10 0 . 6 6 × + = Q is uniformly distributed over a ring of radius cm 5 . 4 = a . (a) What is the electric field at the centre of the ring? (b) What is the electric potential at the centre of the ring? (c) How much work would you need to do to slowly pull an electron from the centre of the ring to a point infinitely far away? [6] 4. The electric potential in a region of space is given by axy V = where 7 . 1 = a V/m 2 . (a) What is the electric field at the point x = 3.5 m, y = 2.0 m? Give your answer in unit vector notation. (b) If a particle of mass 27 10 67 . 1 × = m kg and charge 19 10 6 . 1 × + = q C is released from this point, what is the magnitude of its initial acceleration?

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Circle instructor: Yethiraj or Morrow 4 Name:__________________________ Lab period: _____________ Student Number:______________________ [6] 5. A wire is located at 0 = x , 0 . 2 = y cm and carries a current of 75 . 0 = I A out of the page (parallel to the z axis) as shown. Point P is located at 0 . 2
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## This note was uploaded on 03/08/2012 for the course PHYSICS 1051 taught by Professor Michaelmorrow during the Winter '12 term at Memorial University.

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P1051W10 - Circle instructor: Yethiraj or Morrow Lab...

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