A datalogger demonstration of electromagnetic induction with a falling, oscillating and swinging magnet

Wong, Darren; Lee, Paul; Foong, See Kit

doi:10.1088/0031-9120/45/4/011

Cited by 9 publications

(7 citation statements)

References 5 publications

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“…There has been various studies on the phenomenon of electromagnetic induction with sensors such as the classic example of a magnet falling through a coil [4], where the acceleration due to gravity can be calculated [5]. Other experiments involved magnets moving at constant speed through a coil, swinging as a magnetic pendulum over a coil, and oscillating in a coil [6][7][8]. This paper probes deeper into the emf induced in a coil due to an oscillating bar magnet along the coil's axis as the amplitude of oscillation was varied.…”

Section: Introductionmentioning

confidence: 99%

Making sense of the induced emf in a coil using sensors and visualisation of the voltage–force parametric plot

Wong,

Lee

2024

Phys. Educ.

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We investigated the emf (V) induced with time (t) in a search coil due to an oscillating bar magnet along the axis of the coil using the IOLab device. Experimental data was simultaneously collected with the force sensor which tracked the oscillation of the magnet and the voltage sensor which gave real-time readings of the induced emf in the coil. For small amplitudes of oscillation, where the predominant interaction involved the top end of the magnet cutting through the plane of the coil, the V–t graph appeared sinusoidal. With increasing amplitudes of oscillation, the V–t graph started to lose its symmetry with an initial kink appearing within one half cycle and which eventually became an increasing hump as the amplitude of oscillation increased further due to the influence from the bottom end of the bar magnet which affected the overall rate of change of magnetic flux linkage through the coil. The data collected from the experiment was visualised using a novel parametric series of plots of induced emf (V) with force (F). We discussed various cases of the V–F parametric plot. Using a suitable Φ–h function and taking into consideration the rate of change of magnetic flux linkage with respect to displacement along the coil, we discussed how the emf induced changes with time with increasing amplitudes of oscillation.

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Section: Introductionmentioning

confidence: 99%

Making sense of the induced emf in a coil using sensors and visualisation of the voltage–force parametric plot

Wong,

Lee

2024

Phys. Educ.

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“…Most of them deal with pulses induced by a magnet falling through a coil or inside a conductive pipe [1][2][3][4][5][6][7][8]. Many experiments related to the electromagnetic induction law using harmonic oscillation have been reported; however, they are limited to analyzing the time variation of the magnetic flux by integrating the waveform data of the induced voltage [9]. Many studies have suggested experimental devices and application methods for the analysis of electromagnetic induction phenomena [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Theory and experiment for a solenoid based currents and the magnetic drag

Jang

et al. 2023

Eur. J. Phys.

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In this study, we derived formulas for the current waveforms induced by a magnet oscillating at arbitrary positions on the axis of a solenoid. We also conducted an experiment for measuring the currents induced in a solenoid by a magnet oscillating in the inner or outer region of a solenoid and compared the results with the theoretical predictions. It was confirmed that the magnitude and shape of waveforms of induced currents that were obtained from the derived formulas fit well with experimental results. In addition, the magnetic drag force exerted on the magnet by the induced current is formulated and compared with the prediction estimated by the attenuation coefficient and velocity.

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“…Some authors looked at the connections between the magnet and coil relative velocity and the induced signal shape, amplitude and width. Others discussed different signal acquisition methods [3][4][5][6][10][11][12][13][14][15]. Applications, for example measuring the speed of a magnet passing through a coil were discussed [2,4,7].…”

Section: Introductionmentioning

confidence: 99%

Measuring g using magnetic induction

Riad

2023

Phys. Educ.

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In this article we present an open source setup for measuring the acceleration due to gravity g utilising Faraday’s law of induction. The signal is acquired using an Arduino Uno board, then displayed and analysed using a Python based graphical user interface. The acceleration due to gravity g is calculated by measuring the crossing times of a bar magnet as it falls simultaneously through a number of coils.

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A datalogger demonstration of electromagnetic induction with a falling, oscillating and swinging magnet

Cited by 9 publications

References 5 publications

Making sense of the induced emf in a coil using sensors and visualisation of the voltage–force parametric plot

Making sense of the induced emf in a coil using sensors and visualisation of the voltage–force parametric plot

Theory and experiment for a solenoid based currents and the magnetic drag

Measuring g using magnetic induction

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