Metal frame moved through uniform magnetic field

In summary, a square rigid metal frame PQRS with side 12 cm forms a closed circuit with an ammeter. It is moved through an enclosed region of uniform magnetic field of flux density 2.0 × 10–2 T, from left to right. The ammeter shows the direction of the current when entering as anti-clockwise, in the middle as no current, and when leaving as clockwise. The direction of the current can be determined using Lenz's Law instead of Flemings Left Hand rule.
  • #1
Masafi
65
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A square rigid metal frame PQRS, of side 12 cm, forms a closed circuit with an ammeter. It is moved through an enclosed region of uniform magnetic field of flux density 2.0 × 10–2 T, from left to right. The field is confined to this area and directed into the page.

PQRS --> magnetic field -->

Give the direction of the current through the ammeter when enterting, in the middle, and leaving:

1. entering: anti clockwise
2. middle: no current (not cutting any lines of flux)
3. leaving: clockwise

How do we determine the direction of the current? I cannot do this using Flemings Left Hand rule?
 
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  • #2
Lenz's Law.
 

What is a metal frame moved through a uniform magnetic field?

A metal frame moved through a uniform magnetic field refers to the phenomenon where a conducting material, such as a metal frame, experiences a force when placed in a magnetic field. This force is known as the Lorentz force and is the result of the interaction between the magnetic field and the moving electric charges within the metal frame.

How does a metal frame move in a uniform magnetic field?

A metal frame will move in a uniform magnetic field due to the Lorentz force. This force is perpendicular to both the direction of the magnetic field and the direction of motion of the metal frame. The magnitude of the force is dependent on the strength of the magnetic field, the velocity of the metal frame, and the angle between the two.

What is the direction of the Lorentz force on a metal frame?

The direction of the Lorentz force on a metal frame is always perpendicular to both the direction of the magnetic field and the direction of motion of the metal frame. The direction can be determined using the right hand rule, where the thumb points in the direction of the motion, the index finger points in the direction of the magnetic field, and the middle finger points in the direction of the force.

What factors affect the magnitude of the Lorentz force on a metal frame?

The magnitude of the Lorentz force on a metal frame depends on the strength of the magnetic field, the velocity of the metal frame, and the angle between the two. As the magnetic field or velocity increases, the force also increases. The force will be greatest when the metal frame moves perpendicular to the magnetic field.

What is the application of a metal frame moving through a uniform magnetic field?

The application of a metal frame moving through a uniform magnetic field is commonly seen in devices such as electric motors, generators, and speakers. These devices use the Lorentz force to convert electrical energy into mechanical motion or vice versa. This phenomenon is also utilized in particle accelerators and magnetic levitation trains.

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