Suppose that you want to design a solenoid to control magnetically the central locking system of your car doors. This needs a magnetic induction at the end of the coil of 0.837 T. To be compact enough to fit next to the window winder mechanism, the coil can be only 3.18 cm long and 0.916 cm in diameter. The car battery can supply 8.37 A. How many turns of wire does the coil need to have if it has air as its core? turns

Suppose that you want to design a solenoid to control magnetically the central locking system of your car doors. This needs a magnetic induction at the end of the coil of 0.837 T. To be compact enough to fit next to the window winder mechanism, the coil can be only 3.18 cm long and 0.916 cm in diameter. The car battery can supply 8.37 A. How many turns of wire does the coil need to have if it has air as its core? turns

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter13: Electromagnetic Induction

Section: Chapter Questions

Problem 74AP: The armature and field coils of a series-wound motor have a total resistance of 3.0 . When connected...

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The armature and field coils of a series-wound motor have a total resistance of 3.0 . When connected to a 120-V source and running at normal speed, the motor draws 4.0 A. (a) How large is tire back emf? (b) What current will the motor draw just after it is turned on? Can you suggest a way to avoid this large initial current?
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