Study of the conductivity of a metallic tube by analysing the damped fall of a magnet

Íñiguez, J.; Raposo, V.; Hernández-López, A; Flores, A. G.; Zazo, M.

doi:10.1088/0143-0807/25/5/002

Cited by 29 publications

(40 citation statements)

References 8 publications

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“…The basic theory is explained in many papers [1][2][3][4][5][6][7][8][9][10][11][12], though a short description is given here for understanding the problem. When a permanent magnet is released through a metallic pipe, the magnetic flux through the metallic surface changes as it falls.…”

Section: Theorymentioning

confidence: 99%

“…For finding the conductivity of metallic pipe, Iniguez et al [7] developed an equation by connecting the conductivity and speed of the falling object as given below,…”

Section: By Rearranging the Equation We Getmentioning

confidence: 99%

“…The fall of a magnet inside a conducting pipe is damped by the opposing force due to the eddy current generated in the conducting pipe. This phenomenon is demonstrated in many places and many people have described the mathematical model of the fall of the magnet through the conducting pipe [1][2][3][4][5][6][7][8][9][10][11][12]. Further, this magnetic damping is exploited in a diversity of important applications including advanced car suspension systems that use a colloidal suspension, the smooth braking.…”

Section: Introductionmentioning

confidence: 99%

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Study of magnet fall through conducting pipes using a data logger

Thottoli¹,

Fayis²,

Mohamed³

et al. 2019

SN Appl. Sci.

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Amusing students by dropping a magnet through a metal pipe is a common activity in many classrooms. Students will be excited to see the slow movement of the magnet through the pipe due to the eddy current and its damping force. This activity can be performed to enhance their knowledge about the properties of magnet and metal pipes if we are able to get data from this experiment. This case study prepared by performing the magnet fall activity by incorporating ExpEYES17 data logger and extracted the information such as the magnetic flux, terminal velocity of the magnet in the pipe, dragging coefficient and conductivity of the metal pipe.

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Section: Theorymentioning

confidence: 99%

“…For finding the conductivity of metallic pipe, Iniguez et al [7] developed an equation by connecting the conductivity and speed of the falling object as given below,…”

Section: By Rearranging the Equation We Getmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of magnet fall through conducting pipes using a data logger

Thottoli¹,

Fayis²,

Mohamed³

et al. 2019

SN Appl. Sci.

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“…which, following Iniguez et al (2004), allows us to write the time taken to reach terminal or asymptotic speed, τ , as…”

Section: Towards An Explanationmentioning

confidence: 99%

“…Demonstrating Lenz's law by dropping a neodymium magnet down a length of copper tube is not a new activity in any course which involves the use of Lenz's law. Indeed novel ways of using neodymium magnets have been recently published (Saravia 2006, Featonby 2006, Iniguez et al 2004, Roy et al 2007, Pelesko et al 2005. However, we offer here a twist to previous work by the use of stacks of magnets and by requiring students to predict trends from limited evidence.…”

Section: Introductionmentioning

confidence: 97%

Reply to ‘Comment on “Magnetic braking revisited: activities for the undergraduate laboratory”’

Ireson¹

2009

Eur. J. Phys.

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The unusual phenomenon of electromagnetic induction

Deng

Chen

2021

AIP Advances

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This paper describes the unusual phenomenon of electromagnetic induction that occurs when a Nd–Fe–B magnet is passed through a hollow paramagnetic aluminum tube and conduction of eddy current happens. It was observed that the time taken by the Nd–Fe–B magnet to pass through a 1 m aluminum tube is longer than that through a 2 m tube. A tentative theory for this phenomenon is that due to the paramagnetism of the aluminum tube, the 2 m tube induces a more potent induction to pull the Nd–Fe–B magnet downward than that present in the 1 m tube. This scientific effect, which is coined herein as a length-boost effect, can create a situation that contradicts the conventional thinking that it should take a longer time to fall through a longer tube. One application of this is in controlling the velocity of a falling Nd–Fe–B magnet by changing the length of the aluminum pipe. The other is using aluminum as braking fins in free-fall chairs at amusement parks to reduce heat dissipation. However, diamagnetic tubes, such as those composed of copper and brass, do not possess this effect. A magnet falling through longer tubes of these metals takes a longer time than through shorter tubes.

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Study of the conductivity of a metallic tube by analysing the damped fall of a magnet

Abstract: The fall of a magnet through a hollow conducting tube is described. Although this experiment is well known, a detailed treatment by means of a circuit analysis allows us to relate the conductivity of the tube to the characteristic parameters of the experiment.

Cited by 29 publications

References 8 publications

Study of magnet fall through conducting pipes using a data logger

Study of magnet fall through conducting pipes using a data logger

Reply to ‘Comment on “Magnetic braking revisited: activities for the undergraduate laboratory”’

The unusual phenomenon of electromagnetic induction

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