Basic Physies Il, PHY 202-02, Spring 201 Test 1 2-Ch20.21,22 Section Name of the

Question

Basic Physies Il, PHY 202-02, Spring 201 Test 1 2-Ch20.21,22 Section Name of the student ale Lee Date 97Marsh 2018 Closed book, closed notes Answer all questions with steps and units for full credit. Multiple choice questions: 1. (10 points) Alpha particles (charge - +2e, mass 6.68 x 10kg) are accelerated in a cyclotson to a final it radius of 0.80 m. The magnetic field in the cyclotron is 0.90 T. The period of oircular motion of the alpha particles is closest to: A) 0.36 us, B) 0.44 s C) 0.15 Hs D) 0.22 jus, E)0.29 5 2. (10 points) A very long wire generates a magnetic field of 0,0030 104 T at a distance of 2.0mm. What is the magnitude of the current? A) 9400 mA, D) 3000 mA C) 1.5 mA, B) 3.0 mA,

Explanation / Answer

A)

Radius, r = mv /qB = (6.68 x 10-27 x v) / (2 x 1.6 x 10-19 x 0.90) = 0.80

Velocity, v = 3.45 x 107 m/s

Time period, t = (2 pi r)/ v = (2 pi x 0.8)/ (3.45 x 107) = 1.46 x 10-7 sec ~ 0.15 micro sec Option (C)

B)

Magnetic field, B = (10-7 x 2 x I)/ 0.002 = 0.003 x 10-4

=> Current, I = 3 mA Option (B)

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