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Chapter 29: Problem 10

People with pacemakers or other mechanical devices as implants are often warned to stay away from large machinery or motors. Why?

Short Answer

Expert verified
Answer: Individuals with pacemakers or other mechanical implants are warned to stay away from large machinery or motors because the strong magnetic fields generated by these devices can interfere with the functioning of their implants. This interference can lead to irregular heart rates or other adverse effects related to the malfunction of the implant. To ensure safety and proper functioning, it is recommended to maintain a distance of at least 2 meters (6 feet) from any equipment that might generate strong magnetic fields.

Step by step solution

01

Understand the function of a pacemaker or implant

A pacemaker is a small electronic device that helps regulate the heart's rhythm when the heart's natural pacemaker is not functioning properly. Other mechanical implants can be used to aid various bodily functions.
02

Learn about magnetic fields

A magnetic field is a region around a magnet or an electric current where magnetic force is experienced. Large machinery, motors, and electrical appliances produce magnetic fields when they are operating. The strength of a magnetic field depends on the size of the current and the distance from the source.
03

Pacemakers and magnetic fields

Pacemakers and other implanted devices are sensitive to strong external magnetic fields. These magnetic fields can interfere with the device's function, affect the settings, or, in some cases, can potentially shut down the device. This can be harmful to the person with the implant, as it may lead to their heart rate becoming irregular or other adverse effects related to the malfunction of the device.
04

Maintaining a safe distance

To ensure the safety and proper functioning of pacemakers and other implants, it's crucial to maintain a safe distance from large machinery or motors that generate strong magnetic fields. Generally, the recommended distance is at least 2 meters (approximately 6 feet) from any equipment that might generate strong magnetic fields. By following these guidelines, individuals with pacemakers and other mechanical devices as implants can minimize the risk of interference with their device and maintain their overall health and safety.

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Most popular questions from this chapter

An ideal battery (with no internal resistance) supplies \(V_{\mathrm{emf}}\) and is connected to a superconducting (no resistance!) coil of inductance \(L\) at time \(t=0 .\) Find the current in the coil as a function of time, \(i(t) .\) Assume that all connections also have zero resistance.

A wedding ring (of diameter \(2.0 \mathrm{~cm}\) ) is tossed into the air and given a spin, resulting in an angular velocity of 17 rotations per second. The rotation axis is a diameter of the ring. Taking the magnitude of the Earth's magnetic field to be \(4.0 \cdot 10^{-5} \mathrm{~T}\), what is the maximum induced potential difference in the ring?

An electromagnetic wave propagating in vacuum has electric and magnetic fields given by \(\vec{E}(\vec{x}, t)=\vec{E}_{0} \cos (\vec{k} \cdot \vec{x}-\omega t)\) and \(\vec{B}(\vec{x}, t)=\vec{B}_{0} \cos (\vec{k} \cdot \vec{x}-\omega t)\) where \(\vec{B}_{0}\) is given by \(\vec{B}_{0}=\vec{k} \times \vec{E}_{0} / \omega\) and the wave vector \(\vec{k}\) is perpendicular to both \(\vec{E}_{0}\) and \(\vec{B}_{0} .\) The magnitude of \(\vec{k}\) and the angular frequency \(\omega\) satisfy the dispersion relation, \(\omega /|\vec{k}|=\left(\mu_{0} \epsilon_{0}\right)^{-1 / 2},\) where \(\mu_{0}\) and \(\epsilon_{0}\) are the permeability and permittivity of free space, respectively. Such a wave transports energy in both its electric and magnetic fields. Calculate the ratio of the energy densities of the magnetic and electric fields, \(u_{B} / u_{E}\), in this wave. Simplify your final answer as much as possible.

Having just learned that there is energy associated with magnetic fields, an inventor sets out to tap the energy associated with the Earth's magnetic field. What volume of space near Earth's surface contains \(1 \mathrm{~J}\) of energy, assuming the strength of the magnetic field to be \(5.0 \cdot 10^{-5} \mathrm{~T} ?\)

A short coil with radius \(R=10.0 \mathrm{~cm}\) contains \(N=30.0\) turns and surrounds a long solenoid with radius \(r=8.00 \mathrm{~cm}\) containing \(n=60\) turns per centimeter. The current in the short coil is increased at a constant rate from zero to \(i=2.00 \mathrm{~A}\) in a time of \(t=12.0 \mathrm{~s}\). Calculate the induced potential difference in the long solenoid while the current is increasing in the short coil.
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