Electrical Engineering · Question Bank

Magnetic Circuits

22 of 84 questions match · page 1 of 2. Answer in your head first, then check the solution.

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TypeAll 78Problem solving 22Objective 56
DifficultyAll 28Easy 22Medium 5Hard 1
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#1📜 EE Pre-Board August 2012📘 PowerhouseEasy
What is the force between two wires carrying currents 10 and 50 A each? The lengths of the wires are 50 cm and are separated by 5 cm distance.
A0.005 N
B0.002 N
C0.001 N
D0.004 N
#2📜 EE Pre-Board August 2012📘 PowerhouseEasy
A magnetizing force of 1000 AT/m will produce a flux density of _ in air.
A0.63 mWb/m²
B0.63 Wb/m³
C1.257 mWb/m³
D1.257 Wb/m³
#3📜 EE Pre-Board March 2013📘 PowerhouseEasy
A current of 10 A is flowing in a flexible conductor of length 1.5 m. A force of 15 N acts on it when it is placed in a uniform field of 2 T. Calculate the angle between the magnetic field and the direction of the current.
A30°
B45°
C60°
D90°
#4📜 EE Pre-Board March 2013📘 PowerhouseEasy
Calculate the magnetic field intensity to produce a flux density of \(10 \times 10^{-3}\) tesla at the center of a long straight solenoid.
A6,423 AT/m
B7,958 AT/m
C8,323 AT/m
D7,869 AT/m
#5📜 EE Pre-Board August 2013📘 PowerhouseEasy
Two straight parallel wires 2 m long and 3 mm apart carry a current of 8 A in opposite directions. Calculate the force between these conductors.
A\(8.25 \times 10^{-3}\) N
B\(8.75 \times 10^{-3}\) N
C\(8.33 \times 10^{-3}\) N
D\(8.53 \times 10^{-3}\) N
#6📜 EE Pre-Board August 2013📘 PowerhouseEasy
An air cored coil has 500 turns. The mean length of magnetic flux path is 50 cm and the area of cross-section is \(5 \times 10^{-4}\) m² . If the exciting current is 5 A, determine the flux density.
A\(3.1415 \times 10^{-3}\) T
B\(3.1415 \times 10^{-4}\) T
C\(6.283 \times 10^{-3}\) T
D\(6.283 \times 10^{-4}\) T
#7📜 EE Pre-Board March 2014📘 PowerhouseEasy
A wire 36 inches long is carrying a current of 1,200 A. Find the flux density in gauss at a point 12 inches from the wire.
A2.4
B7.87
C6.31
D5.52
#8📜 EE Pre-Board March 2014📘 PowerhouseEasy
An air gap 1.1 mm long and 40 cm² in cross-section exists in a magnetic circuit. Determine the mmf required to create a flux of \(10 \times 10^{-4}\) Wb in the air gap.
A2.1885 AT
B21.885 AT
C218.85 AT
D2,188.5 AT
#9📜 EE Pre-Board August 2014📘 PowerhouseEasy
Two long straight conductors each carrying an electric current of 5A are kept parallel to each other at a separation of 2.5cm. Calculate the magnitude of magnetic force experienced by 10cm of a conductor.
A\(2 \times 10^{-3}\) N
B\(2 \times 10^{-4}\) N
C\(2 \times 10^{-5}\) N
D\(2 \times 10^{-6}\) N
#10📜 EE Pre-Board March 2015📘 PowerhouseEasy
A horizontal powerline carries a current of 90 A. Compute the magnetic field at a point 1.5 m below the line.
A\(1.2 \times 10^{-5}\) T
B\(1.2 \times 10^{-4}\) T
C\(1.2 \times 10^{-3}\) T
D\(1.2 \times 10^{-2}\) T
#11📜 EE Pre-Board March 2015📘 PowerhouseEasy
A wire length 1 m carries a current of 10 A perpendicular to a field of flux density 0.5 T. Determine the magnitude of the force on the wire.
A5 N
B50 N
C10 N
D100 N
#12📜 EE Pre-Board March 2015📘 PowerhouseEasy
Two conductors carrying 50 amperes and 75 amperes respectively are placed 10 cm apart. Calculate the force between them per meter.
A0.075 N/m
B100 N/m
C0.0075 N/m
D10 N/m
#13📜 EE Pre-Board August 2015📘 PowerhouseEasy
The core of a certain magnetic circuit has a length of 5 cm and the inductance of the coil is 10 mH. What is the inductance of the same if the number of turns is reduced to 1/2 of the original? All other factors are unchanged.
A20 mH
B10 mH
C2.5 mH
D5.0 mH
#14📜 EE Pre-Board August 2015📘 PowerhouseEasy
An electromagnet has an air gap of 3 mm and the flux density in the gap is 1.257 Wb/m² . Calculate the ampere-turns required for the gap.
A2000
B2,500
C3,000
D4,000
#15📜 EE Pre-Board August 2015📘 PowerhouseEasy
Two long straight conductors each carrying an electric current of 5A are kept parallel to each other at a separation of 2.5cm. Calculate the magnitude of magnetic force experienced by 10cm of a conductor.
A\(5 \times 10^{-5}\) N
B\(4 \times 10^{-5}\) N
C\(3 \times 10^{-5}\) N
D\(2 \times 10^{-5}\) N
#16📜 EE Pre-Board March 2016📘 PowerhouseEasy
A current of 10 A is flowing in a flexible conductor of length 1.5 m. A force of 15 N acts on it when it is placed in uniform field of 2 T. Calculate the angle between the magnetic field and the direction of the current.
A90°
B60°
C45°
D30°
#17📜 EE Pre-Board March 2017📘 PowerhouseEasy
The flux produced in the air gap between two electromagnetic pole faces is \(6 \times 10^{-2}\) Wb. The length of the air gap is 1.4 cm and the cross-sectional area of the gap is 0.3 m². Find the magnetic field intensity.
A\(153.2 \times 10^{3}\) AT/m
B\(155.2 \times 10^{3}\) AT/m
C\(157.2 \times 10^{3}\) AT/m
D\(159.2 \times 10^{3}\) AT/m
#18📜 EE Pre-Board August 2017📘 PowerhouseEasy
Two conductors carrying 50 amperes and 75 amperes respectively are placed 10 cm apart. Calculate the force between them per meter.
A0.075 N/m
B0.0375 N/m
C0.0075 N/m
D0.00375 N/m
#19📜 EE Pre-Board August 2017📘 PowerhouseEasy
Calculate the AT/m needed to produce a flux density of 0.001 Wb/m² at the center of a long straight solenoid.
A0.796
B79.6
C7,958
D796
#20📜 EE Pre-Board August 2017📘 PowerhouseEasy
A straight conductor 100 cm long and carrying 40 A lies perpendicular to a magnetic field of 1.5 T. What is the mechanical power in watts required to move the conductor at a uniform speed of 5 meters per second?
A60 W
B7.5 W
C200 W
D300 W

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