An iron ring 100 cm mean circumference is made from round iron of cross section \(10^{-3}\) m². Its relative permeability is 500. If it is wound with 250 turns, what current will be required to produce a flux of \(2 \times 10^{-3}\) Wb?
A21.47 A
B14.27 A
C12.74 A
D17.42 A
#2📜 EE Pre-Board March 2013📘 PowerhouseMedium
Determine the inductance L of a coil of 500 turns wound on an air cored torroidal ring having a mean diameter of 300mm. The ring has a circular cross section of diameter 50mm.
A\(6.54 \times 10^{-3}\) H
B\(6.54 \times 10^{-4}\) H
C\(3.27 \times 10^{-3}\) H
D\(3.27 \times 10^{-4}\) H
#3📜 EE Pre-Board August 2014📘 PowerhouseMedium
An iron core has a cross-section of 500 mm² and a length of 100 cm. A magnetizing force of 500 AT in it produces a magnetic flux of 400 μWb. Determine the relative permeability of the material.
A1,275
B1,250
C1,225
D1,200
#4📜 EE Pre-Board March 2017📘 PowerhouseMedium
An air cored toroidal coil has 450 turns, a mean diameter of 300 mm and a cross-sectional area of 300 mm². Determine the self-inductance of the coil.
A\(81 \times 10^{-4}\) H
B\(8.1 \times 10^{-4}\) H
C\(0.81 \times 10^{-4}\) H
D\(0.081 \times 10^{-4}\) H
#5📜 EE Pre-Board August 2017📘 PowerhouseMedium
An air core toroidal coil has 120 turns and a length of 12 cm. What current is required to set up a flux of \(1.2 \times 10^{-6}\) weber if the cross-sectional area is 12 square cm?
