Related Concept Videos
01:18Magnetic Field Due to Two Straight Wires
Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
01:27Magnetic Field Due To A Thin Straight Wire
Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
01:16Magnetic Field Of A Current Loop
Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
01:22Magnetic Force On Current-Carrying Wires: Example
In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
01:17Force On A Current Loop In A Magnetic Field
Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
01:17Magnetic Damping
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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Related Experiment Video
Updated: Jun 20, 2026
08:23
A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
Published on: September 30, 2019
Magnetostrictive fiber-optic sensor system for detecting dc magnetic fields.
Optics Letters
|September 1, 2009
Summary
This study introduces a new fiber-optic sensor using amorphous iron-boron alloy for detecting magnetic fields. The novel system demonstrates superior performance over traditional nickel sensors.
Area of Science:
- Materials Science
- Sensor Technology
- Physics
Background:
- Magnetostrictive materials are crucial for magnetic field sensing.
- Amorphous alloys offer unique magnetic properties.
- Fiber-optic sensors provide sensitive and remote measurement capabilities.
Purpose of the Study:
- To develop a magnetostrictive fiber-optic sensor system.
- To investigate the use of amorphous Fe(80)B(20) alloy for DC magnetic field measurement.
- To compare the sensing performance of amorphous alloys with nickel.
Main Methods:
- Coating a thin film of amorphous Fe(80)B(20) alloy onto fiber optic cladding.
- Developing a novel detection system for DC magnetic field measurement.
- Characterizing the sensor's response to magnetic fields.
Main Results:
- The developed sensor system successfully measures DC magnetic fields.
- Amorphous Fe(80)B(20) alloy exhibits advantages over nickel for sensing applications.
- The thin film coating on the fiber cladding is effective for sensing.
Conclusions:
- The novel magnetostrictive fiber-optic sensor system is effective for DC magnetic field detection.
- Amorphous alloys present a promising alternative to nickel in magnetic sensing.
- This technology has potential applications in various fields requiring magnetic field monitoring.