2008PracticeExam4

2008PracticeExam4 - Name: _ Code # _ Summer Session 2008...

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Name: ________________________________________ Code # _________ Summer Session 2008 ID: X 7 UCSD Physics 2B Practice Exam 4 Magnetism & Induction READ ME !!! Helpful Hints: Do this exam a few times. .. Once without the answers, Once after seeing the solutions & Once again with your formula sheet This is a good time to add formulas/constants to your sheet. Remember, this is a timed exam. .. work swiftly so you have time to check your answers. 1. A proton with charge q = e + is moving with velocity v at an angle of θ = 50 ° to the direction of a magnetic field B . The component of the resulting force in the direction of B is A. evB sin(50º) cos(50º) C. zero B. evB sin(50º) D. evB cos(50º) 2. A charged particle is moving horizontally westward with a velocity of v = 3.5 × 10 6 m / s in a region where there is a magnetic field of magnitude B = 5.6 × 5 T directed due North. If the particle experiences a force F = 7.8 × 16 N upward (out of the page) what is the magnitude and sign of the charge on the particle? A. + 4.9 × 5 C B. 4.0 × 18 C C. + 1.4 × 11 C D. 1.2 × 14 C
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Name: ________________________ ID: A 2 3. A long straight wire parallel to the y -axis carries a current of I = 6.3 A j 8 in a region of uniform magnetic field B = 1.5 T i 8 . What is the force per unit length on the wire? A. + 6.3 N m k 8 B. + 9.5 N m k 8 C. 6.3 N m k 8 D. 9.5 N m k 8 4. Two long, parallel wires are spaced 1.0 m apart in air and each carry a current of 1.0 A. What is the force per unit length that each wire exerts on the other? A. 2 π × 10 6 N m B. 2.0 × 5 N m C. 2.0 × 7 N m D. 2 × 5 N m 5. A circular 20 turn coil has a radius r = 5.0 cm . What is the magnitude of the coil's magnetic dipole moment when it carries a current of I = 2.5 A ? A. 1.5 A•m 2 B. 0.15 A•m 2 C. 3.9 kA•m 2 D. 0.39 A•m 2 6. A circular 20 turn coil of radius 5.0 cm is so oriented that its axis makes a 30º angle with a uniform magnetic field of 0.15 T. What is the torque on the coil when it carries a current of 2.5 A? A. 1.5 × 3 N m C. 2.9 × 2 N m B. 9.4 × 3 N m D. 5.1 × 2 N m
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Name: ________________________ ID: A 3 7. A circular loop of wire of radius a = 6.0 cm has N = 30 turns and lies in the x-y plane. It carries a current I = 5.0 A . What is the magnitude of the magnetic field at a point along the axis x = 6.0 cm from the loop center? A. 19 μ T B. 0.56 m T C. 0.11 T D. 56 T 8. Two wires lying in the plane of this page carry equal currents I in opposite directions as shown in the diagram below. What is the magnetic field at a point midway between the wires? A. zero B. into the page C. out of the page D. toward the top or bottom of the page E. toward one of the two wires
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Name: ________________________ ID: A 4 9. A rectangular loop of wire of height h = 2.2 m is immersed to a depth x = 15 m inside a region of uniform magnetic field B = 3.2 T which is perpendicular to the loop as shown below. If the loop has a resistance R = 150 Ohms and is pulled out of the field with velocity v = 3.3 m/s, what will be the dissipated power ?
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This note was uploaded on 08/23/2008 for the course PHYS 2b taught by Professor Schuller during the Summer '08 term at UCSD.

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2008PracticeExam4 - Name: _ Code # _ Summer Session 2008...

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