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a) Spring Armature. - Air gap = 0.2cm N = 200 turns Diameter of core = 0.01m Th Figure Q4a (1) A flux of 0.2.10-4 Wb will establish sufficient attractive force for the armature of the relay shown in Figure Q4a to close the contacts. Determine the current necessary to establish this flux level if it is assumed that the total m.m.f. drop is across the air gap. The permeability of free space is 4n. 10-7H/m. Solenoid (ii) The force, F, exerted on the armature is determined by the equation 0.5B A F = Ho where Bg is the flux density within the air gap and A is the common area of the air gap. Calculate the force exerted when the flux specified in part (i) is established.

a) Spring Armature. - Air gap = 0.2cm N = 200 turns Diameter of core = 0.01m Th Figure Q4a (1) A flux of 0.2.10-4 Wb will establish sufficient attractive force for the armature of the relay shown in Figure Q4a to close the contacts. Determine the current necessary to establish this flux level if it is assumed that the total m.m.f. drop is across the air gap. The permeability of free space is 4n. 10-7H/m. Solenoid (ii) The force, F, exerted on the armature is determined by the equation 0.5B A F = Ho where Bg is the flux density within the air gap and A is the common area of the air gap. Calculate the force exerted when the flux specified in part (i) is established.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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(a) Spring Armature. Air gap= 0.2cm N = 200 turns Diameter of core = 0.01m Solenoid Figure Q4a (i) A flux of 0.2.10-4 Wb will establish sufficient attractive force for the armature of the relay shown in Figure Q4a to close the contacts. Determine the current necessary to establish this flux level if it is assumed that the total m.m.f. drop is across the air gap. The permeability of free space is 4n. 10-7H/m. (ii) The force, F, exerted on the armature is determined by the equation 0.5B²A F = Ho where Bg is the flux density within the air gap and A is the common area of the air gap. Calculate the force exerted when the flux specified in part (i) is established.
Transcribed Image Text:(a) Spring Armature. Air gap= 0.2cm N = 200 turns Diameter of core = 0.01m Solenoid Figure Q4a (i) A flux of 0.2.10-4 Wb will establish sufficient attractive force for the armature of the relay shown in Figure Q4a to close the contacts. Determine the current necessary to establish this flux level if it is assumed that the total m.m.f. drop is across the air gap. The permeability of free space is 4n. 10-7H/m. (ii) The force, F, exerted on the armature is determined by the equation 0.5B²A F = Ho where Bg is the flux density within the air gap and A is the common area of the air gap. Calculate the force exerted when the flux specified in part (i) is established.
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