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(a) A nonferrous screwdriver is being used in a \(2.00 \mathrm{T}\) magnetic field. What maximum emf can be induced along its \(12.0 \mathrm{cm}\) length when it moves at \(6.00 \mathrm{m} / \mathrm{s} ?\) (b) Is it likely that this emf will have any consequences or even be noticed?

Short Answer

Expert verified
The maximum emf induced in the screwdriver is approximately 1.44 V. This emf is comparable to a small battery and is unlikely to have noticeable consequences.

Step by step solution

01

Understanding the Problem

We need to calculate the maximum electromotive force (emf) induced in a nonferrous screwdriver when it moves perpendicularly through a magnetic field. The equation for emf induced in a conductor moving through a magnetic field is given by Faraday's law of electromagnetic induction, which is \( emf = B \times v \times l \) where \( B \) is the magnetic field strength, \( v \) is the velocity of the conductor, and \( l \) is the length of the conductor that cuts through the magnetic field lines.
02

Substitute the Given Values

We substitute the given values into the formula for emf: \( B = 2.00 \: \mathrm{T} \) (magnetic field), \( v = 6.00 \: \mathrm{m/s} \) (velocity), and \( l = 12.0 \times 10^{-2} \: \mathrm{m} \) (length of the screwdriver in meters), giving \( emf = 2.00 \times 6.00 \times 12.0 \times 10^{-2} \: \mathrm{V} \).
03

Calculate the Maximum Emf

Perform the multiplication to find the maximum emf: \( emf = 2.00 \times 6.00 \times 12.0 \times 10^{-2} \approx 1.44 \: \mathrm{V} \).
04

Consider the Consequences of the Induced Emf

To determine if the emf will have any consequences or be noticed, we must consider that common household batteries operate at around 1.5 V, which is similar to the induced emf. In most cases, this induced emf is too small to cause any harm or significant effects in typical environments. It may not be noticed in practical situations.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Faraday's Law of Electromagnetic Induction
The magic behind generating electricity through movement lies in Faraday's Law of Electromagnetic Induction. In simpler terms, this law tells us that an electromotive force (usually abbreviated as emf) can be created anytime a conductor moves through a magnetic field. The law is actually quite straightforward: the induced emf in any closed circuit is equal to the negative of the time rate of change of magnetic flux through the circuit.

Imagine slicing through invisible magnetic lines with a metal bar – that's essentially what's happening at a microscopic level when we talk about electromagnetic induction. Faraday's law quantifies this effect and it forms the basis of many electrical machines and devices today, like generators and transformers. The equation from our textbook exercise, \( emf = B \times v \times l \), flows directly from this principle. Here, \( l \) is the length of the conductor within the magnetic field, and it's important that the conductor, the magnetic field, and the motion of the conductor are all perpendicular to receive the maximum emf produced – that's what we mean by 'maximum.'
Magnetic Field Strength
Now, let's dive into magnetic field strength, symbolized as \( B \). It's a measure of how strong a magnetic field is in a given area. Think of it like the density of the magnetic lines of force in a space. It's measured in teslas (T), and the Earth's magnetic field is actually very weak, about \( 10^{-5} \) teslas. But in our exercise, we're dealing with a much stronger field of \( 2.00 \) teslas. That's a strong field like you might find in an MRI machine.

The larger the \( B \) value, the more force exerted on charges moving within that field, and hence more potential to induce a current when there’s motion involved. That's why in our screwdriver scenario, it’s important to pay attention to the magnetic field strength since it directly impacts the induced emf.
Velocity of Conductor
Finally, there's velocity, symbolized by \( v \) in our equation. When we say 'velocity,' we're talking about the speed and direction the screwdriver is moving. Velocity here is crucial because it determines how fast the conductor cuts through the magnetic field lines. No movement means no change in flux, and hence no induced emf. It’s the motion that counts. In the problem, the velocity of the screwdriver is \( 6.00 \: \mathrm{m/s} \), which is quite swift.

This element of speed in relation to the magnetic field plays a big part in determining how much emf will be induced. The faster the conductor moves through the field, the higher the emf. So, movement is key, and for applications like electric generators, they are designed to maximize these movements to generate more electricity. Just as a side note: if the screwdriver had been moving slower, the induced emf would have been correspondingly lower.

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