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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

A rectangular wire loop (dimensions of \(h=15.0 \mathrm{~cm}\) and \(w=8.00 \mathrm{~cm}\) ) with resistance \(R=5.00 \Omega\) is mounted on a door. The Earth's magnetic field, \(B_{\mathrm{E}}=2.6 \cdot 10^{-5} \mathrm{~T}\), is uniform and perpendicular to the surface of the closed door (the surface is in the \(x z\) -plane). At time \(t=0,\) the door is opened (right edge moves toward the \(y\) -axis) at a constant rate, with an opening angle of \(\theta(t)=\omega t,\) where \(\omega=3.5 \mathrm{rad} / \mathrm{s}\) Calculate the direction and the magnitude of the current induced in the loop, \(i(t=0.200 \mathrm{~s})\).

A square conducting loop with sides of length \(L\) is rotating at a constant angular speed, \(\omega\), in a uniform magnetic field of magnitude \(B\). At time \(t=0\), the loop is oriented so that the direction normal to the loop is aligned with the magnetic field. Find an expression for the potential difference induced in the loop as a function of time.

At Los Alamos National Laboratories, one means of producing very large magnetic fields is known as the EPFCG (explosively-pumped flux compression generator), which is used to study the effects of a high-power electromagnetic pulse (EMP) in electronic warfare. Explosives are packed and detonated in the space between a solenoid and a small copper cylinder coaxial with and inside the solenoid, as shown in the figure. The explosion occurs in a very short time and collapses the cylinder rapidly. This rapid change creates inductive currents that keep the magnetic flux constant while the cylinder's radius shrinks by a factor of \(r_{\mathrm{i}} / r_{\mathrm{f}}\). Estimate the magnetic field produced, assuming that the radius is compressed by a factor of 14 and the initial magnitude of the magnetic field, \(B_{i}\), is \(1.0 \mathrm{~T}\).

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.

A long solenoid with length \(3.0 \mathrm{~m}\) and \(n=290\) turns \(/ \mathrm{m}\) carries a current of \(3.0 \mathrm{~A} .\) It stores \(2.8 \mathrm{~J}\) of energy. What is the cross-sectional area of the solenoid?
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