The core of a simple de motor is shown i
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter19: Capacitors
Section: Chapter Questions
Problem 3PA: You find that a 25-F capacitor connected to 480 VAC is defective. The storeroom has no capacitors...
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![The core of a simple de motor is shown in Figure Q1. Assume that the effective cross
section area of each air gap is 18 cm² and the length of each air gap is 0.05cm. The
effective diameter of the rotor core is 4 cm and the cross section area of the iron core is
16 cm?. The relative permeability of the stator and rotor cores is 3800;
i. Determine the total reluctance of the magnetic circuit.
ii. Determine the value of the current that will produce a flux of 0.002 Wb.
30 cm
Scm
1000 turns
4 cm
:5cm
30 cm ..
A = 16 cm?
%3D
Figure Q1](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff16bb19d-48e0-4e11-a941-e21fbab48a39%2Fe31310c5-4e50-4158-a4eb-44eb4bc84e30%2Fksvli8_processed.jpeg&w=3840&q=75)
Transcribed Image Text:The core of a simple de motor is shown in Figure Q1. Assume that the effective cross
section area of each air gap is 18 cm² and the length of each air gap is 0.05cm. The
effective diameter of the rotor core is 4 cm and the cross section area of the iron core is
16 cm?. The relative permeability of the stator and rotor cores is 3800;
i. Determine the total reluctance of the magnetic circuit.
ii. Determine the value of the current that will produce a flux of 0.002 Wb.
30 cm
Scm
1000 turns
4 cm
:5cm
30 cm ..
A = 16 cm?
%3D
Figure Q1
![Given a parallel plate capacitor where the medium between the 2 plates is pure
vacuum, the cross sectional area is 6 x 103 m? and the separation between the plates
is 5 mm:
Determine the value of the capacitance for the capacitor.
ii. If a 120 V source is connected to the capacitor, determine the magnitude
of charge on each plate?
iii. Determine the charge on the plate if acrylic is placed between the plates.
The thickness of the acrylic sheet is 5 mm and its relative permittivity is
given as 6.
iv. Calculate the flux density for the capacitor states in part (iii).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff16bb19d-48e0-4e11-a941-e21fbab48a39%2Fe31310c5-4e50-4158-a4eb-44eb4bc84e30%2Fdsmvc5_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Given a parallel plate capacitor where the medium between the 2 plates is pure
vacuum, the cross sectional area is 6 x 103 m? and the separation between the plates
is 5 mm:
Determine the value of the capacitance for the capacitor.
ii. If a 120 V source is connected to the capacitor, determine the magnitude
of charge on each plate?
iii. Determine the charge on the plate if acrylic is placed between the plates.
The thickness of the acrylic sheet is 5 mm and its relative permittivity is
given as 6.
iv. Calculate the flux density for the capacitor states in part (iii).
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