2009-10-Sem2-Exam - -1- NATIONAL UNIVERSITY OF SINGAPORE...

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- 1 - - 1 - NATIONAL UNIVERSITY OF SINGAPORE PC 1222 Fundamentals of Physics II (Semester II: AY 2009-10) Time Allowed: 2 Hours INSTRUCTIONS TO CANDIDATES 1. This examination paper contains 5 short questions in Part I and 4 long questions in Part II. It comprises 6 printed pages. 2. Answer ALL the questions in Part I and THREE questions in Part II. 3. Answers to the questions are to be written in the answer books. 4. This is a CLOSED BOOK examination. An A4-paper help sheet is allowed. 5. The total mark for Part I is 40 and that for Part II is 60.
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- 2 - - 2 - Part I: Five short questions (answer all, 8 pts each) 1. A long, straight wire carries a straight current of I =0.800 A in the +y direction. A single loop of wire of a square shape has a length of a =25.0 cm each side, and is located in the XY plane as shown in the figure. The left side of the loop is d =25.0 cm away from the long wire and it is moving in the +x direction at a speed of v =3.00 m/s. (a) calculate the induced emf in the square loop at this moment. (4 pts) (b) If the square loop of wire has a resistance of 0.100 , what is the magnitude and direction of the net magnetic force on the loop? (4 pts) 2. A positively charged particle with a speed of 1.05 × 10 7 m/s enters a uniform magnetic field of 3.88 T. The particle moves perpendicular to the magnetic field at all times. The radius of the circular path is measured to be 0.0563 m. (a) what is the mass-to-charge ratio of this particle? (5 pts) (b) Is it a proton or an α -particle? (mass of α -particle: 6.64 × 10 -27 kg; mass of proton: 1.67 × 10 -27 kg) (3 pts) I x y a a d v Fig. 1
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- 3 - - 3 - 3. In a double slit experiment, the distance between two slits is 100
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2009-10-Sem2-Exam - -1- NATIONAL UNIVERSITY OF SINGAPORE...

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