(c) A moving coil voltmeter with a resistance of 20 N gives a full-scale deflection of 120° when a potential difference of 100 mV is applied across it. The moving coil has dimensions of 30 mm x 25 mm and is wound with 100 turns. The control spring constant is 0.375× 10ª Nm/deg. Find the flux density in the air gap. Find also the diameter of copper wire of coil winding if 30% of instrument resistance is due to coil winding. The specific resistance of copper = 1.7 x 10* Nm. %3D
(c) A moving coil voltmeter with a resistance of 20 N gives a full-scale deflection of 120° when a potential difference of 100 mV is applied across it. The moving coil has dimensions of 30 mm x 25 mm and is wound with 100 turns. The control spring constant is 0.375× 10ª Nm/deg. Find the flux density in the air gap. Find also the diameter of copper wire of coil winding if 30% of instrument resistance is due to coil winding. The specific resistance of copper = 1.7 x 10* Nm. %3D
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 8RQ
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![(c) A moving coil voltmeter with a resistance of 20 n gives a full-scale deflection
of 120° when a potential difference of 100 mV is applied across it. The
moving coil has dimensions of 30 mm x 25 mm and is wound with 100 turns.
The control spring constant is 0.375× 10® Nm/deg. Find the flux density in the
air gap. Find also the diameter of copper wire of coil winding if 30% of
instrument resistance is due to coil winding. The specific resistance of copper
=D1.7 x 10* Nm.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F00697ec8-df67-457c-be52-e0c8a5d1d328%2F27b76ad4-74e1-42b5-a303-5ebfe66b2f31%2Fcvwies_processed.jpeg&w=3840&q=75)
Transcribed Image Text:(c) A moving coil voltmeter with a resistance of 20 n gives a full-scale deflection
of 120° when a potential difference of 100 mV is applied across it. The
moving coil has dimensions of 30 mm x 25 mm and is wound with 100 turns.
The control spring constant is 0.375× 10® Nm/deg. Find the flux density in the
air gap. Find also the diameter of copper wire of coil winding if 30% of
instrument resistance is due to coil winding. The specific resistance of copper
=D1.7 x 10* Nm.
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