TEST 3 General Physies II: Physies 2120-1 SPRING 2018 Student\'s Name: Date: \"A

Question

TEST 3 General Physies II: Physies 2120-1 SPRING 2018 Student's Name: Date: "ALL3118 Conceptual Questions (Circle your answer. Answer all questions in this section). 1-1) lopts] The phase angle of an ac circuit is 63. What is the power factor? A) 0.89 B) 0.55 C) 0.45 D) 0.11 I-2) 16pts] Which diagram correctly shows the magnetic field lines created by a circular current loop in which current flows in the direction shown? A) D) B) E) ?? C) 1-3) [6pts] An inductor produces a back emf in a DC series RL circuit when a switch connecting the battery to the circuit is closed. We can explain this by A) Lenz's Law B) Increasing magnetic flux within the coils of the inductor C) Increasing current in the coils of the inductor D) All of the above E) Only A) and C) above

Explanation / Answer

1) (C) 0.45

Power factor = cos(phi) = cos63 = 0.45

2) (C)

3) (D) All of the above.

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