Chapter 13: Problem 9
When is the force experienced by a current-carrying conductor placed in a magnetic field largest?
Short Answer
Expert verified
The force is largest when the angle between the magnetic field and the current is 90 degrees.
Step by step solution
01
Understanding the Formula
The force experienced by a current-carrying conductor in a magnetic field is given by the formula: \(F = BIL \sin(\theta)\)
02
Identify the Components
Here, \(F\) is the force, \(B\) is the magnetic field strength, \(I\) is the current, \(L\) is the length of the conductor in the magnetic field, and \(\theta\) is the angle between the direction of the magnetic field and the current.
03
Determine the Maximum Condition
To maximize the force \(F\), the product \(BIL \sin(\theta)\) must be maximized. Since \(B\), \(I\), and \(L\) are constants, \(\sin(\theta)\) must be maximized.
04
Maximize \(\sin(\theta)\)
The value of \(\sin(\theta)\) is maximum when \(\theta = 90^\circ\), because \(\sin(90^\circ) = 1\).
05
Conclusion
Therefore, the force experienced by a current-carrying conductor placed in a magnetic field is largest when the angle between the direction of the magnetic field and the current is \(90^\circ\).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Magnetic Field Strength
The magnetic field strength, denoted by the symbol \(B\), plays a crucial role in determining the force on a current-carrying conductor.
Magnetic field strength is a measure of the intensity of the magnetic field. The stronger the magnetic field, the greater the force exerted on the conductor.
In the formula \(F = BIL \sin(\theta)\), \(B\) represents this magnetic field strength.
To visualize this better, imagine how powerful a magnet can attract iron objects. This strength or magnetic 'pull' is analogous to the magnetic field strength, which in our context influences the force experienced by the conductor.
Magnetic field strength is a measure of the intensity of the magnetic field. The stronger the magnetic field, the greater the force exerted on the conductor.
In the formula \(F = BIL \sin(\theta)\), \(B\) represents this magnetic field strength.
To visualize this better, imagine how powerful a magnet can attract iron objects. This strength or magnetic 'pull' is analogous to the magnetic field strength, which in our context influences the force experienced by the conductor.
Current
Current is another fundamental factor in determining the force on a current-carrying conductor.
The symbol \(I\) represents the current, which is the flow of electric charge through the conductor. The greater the current, the larger the force experienced by the conductor.
Essentially, higher current means more charged particles moving through the conductor per unit time. This increased charge movement generates a stronger interaction with the magnetic field, thereby increasing the resulting force.
In the formula \(F = BIL \sin(\theta)\), you can see how directly proportional the force \(F\) is to the current \(I\). By increasing \(I\), you can significantly enhance the force on the conductor.
This relation is crucial in many practical applications, like in electric motors where manipulating the current helps control the motor's functionality.
The symbol \(I\) represents the current, which is the flow of electric charge through the conductor. The greater the current, the larger the force experienced by the conductor.
Essentially, higher current means more charged particles moving through the conductor per unit time. This increased charge movement generates a stronger interaction with the magnetic field, thereby increasing the resulting force.
In the formula \(F = BIL \sin(\theta)\), you can see how directly proportional the force \(F\) is to the current \(I\). By increasing \(I\), you can significantly enhance the force on the conductor.
This relation is crucial in many practical applications, like in electric motors where manipulating the current helps control the motor's functionality.
Angle Between Magnetic Field and Current
The angle \(\theta\) between the magnetic field and the current is a key variable that determines the force on a conductor.
This angle affects the value of \sin(\theta)\ in the formula \(F = BIL \sin(\theta)\). The sine function reaches its maximum value of 1 when \(\theta = 90^\circ\).
Therefore, to achieve the largest force, the conductor should be positioned so that the direction of the current is perpendicular to the magnetic field direction.
When the angle is \(90^\circ\), \sin(90^\circ) = 1\, making the force \(F\) maximized to \(BIL\).
If the angle \(\theta\) is smaller, \sin(\theta)\ will be less than 1, and thus the force will be reduced. This concept is crucial for designing systems that utilize magnetic forces, like in electromagnetic cranes used for lifting heavy metallic objects.
By adjusting the angle, one can control and optimize the force experienced by the conductor.
This angle affects the value of \sin(\theta)\ in the formula \(F = BIL \sin(\theta)\). The sine function reaches its maximum value of 1 when \(\theta = 90^\circ\).
Therefore, to achieve the largest force, the conductor should be positioned so that the direction of the current is perpendicular to the magnetic field direction.
When the angle is \(90^\circ\), \sin(90^\circ) = 1\, making the force \(F\) maximized to \(BIL\).
If the angle \(\theta\) is smaller, \sin(\theta)\ will be less than 1, and thus the force will be reduced. This concept is crucial for designing systems that utilize magnetic forces, like in electromagnetic cranes used for lifting heavy metallic objects.
By adjusting the angle, one can control and optimize the force experienced by the conductor.