An 820 turn wire coil of resistance 28.0 2 is placed around a 12500 turn solenoid, 7.60 cm long, as shown in the figure below. Both coil and solenoid have cross-sectional areas of 1.20 x 10-4 m². 60.0 V 14.0 Ω W 12 500 turns Rc 820 turns (a) How long does it take the solenoid current to reach 63.2% of its maximum value? 22.1 ms (b) Determine the average back emf caused by the self-inductance of the solenoid during this interval. 38 V A (c) Determine the average rate of change in magnetic flux through the coil during this interval. X Your response differs from the correct answer by more than 10%. Double check your calculations. V (d) Determine the magnitude of the average induced current in the coil.

An 820 turn wire coil of resistance 28.0 2 is placed around a 12500 turn solenoid, 7.60 cm long, as shown in the figure below. Both coil and solenoid have cross-sectional areas of 1.20 x 10-4 m². 60.0 V 14.0 Ω W 12 500 turns Rc 820 turns (a) How long does it take the solenoid current to reach 63.2% of its maximum value? 22.1 ms (b) Determine the average back emf caused by the self-inductance of the solenoid during this interval. 38 V A (c) Determine the average rate of change in magnetic flux through the coil during this interval. X Your response differs from the correct answer by more than 10%. Double check your calculations. V (d) Determine the magnitude of the average induced current in the coil.

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter3: Magnetic Starters

Section: Chapter Questions

Problem 30SQ

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