Direction of Induced Current for A Moving Loop of Wire

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In summary, when a loop of wire is steadily lowered over a short solenoid with a constant counterclockwise current passing through it, the direction of the induced current at the midpoint of the solenoid and still moving downward is still clockwise. The field of the solenoid is pointing upward, and as the loop is lowered, the flux through it is increasing. This causes the induced current to oppose the change in flux, in accordance with Faraday's/Lenz's law. The flux does not change in the middle of the solenoid.
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JasonBourneV
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A loop of wire is initially held above a short solenoid. A constant counterclockwise (as viewed from above) current passes through the coils of the solenoid. Suppose that the loop of wire is steadily lowered, passing over the solenoid.
What is the direction of the induced current when the loop is at the midpoint of the solenoid and still moving downward?

When the loop is at the top, I know the current is clockwise. But how do I do this one? Is it still clockwise?
 
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Which way is the field of the solenoid pointing? As the loop is lowered, how is the flux through it changing? The induced current always opposes any change in flux. (Faraday's/Lenz's law.)
 
  • #3
um, it doesn't change in the middle?
 

FAQ: Direction of Induced Current for A Moving Loop of Wire

1. What factors determine the direction of induced current in a moving loop of wire?

The direction of induced current in a moving loop of wire is determined by the direction of motion of the wire, the strength and direction of the magnetic field, and the orientation of the wire in the magnetic field.

2. How does the direction of motion affect the direction of induced current?

The direction of motion of the wire determines the direction of induced current. When a wire moves parallel to a magnetic field, the induced current will flow in a direction perpendicular to both the wire's motion and the magnetic field. If the wire moves perpendicular to the magnetic field, the induced current will flow in a direction parallel to both the wire's motion and the magnetic field.

3. What is the relationship between the strength of the magnetic field and the direction of induced current?

The direction of induced current is directly proportional to the strength of the magnetic field. A stronger magnetic field will result in a larger induced current, while a weaker magnetic field will result in a smaller induced current.

4. How does the orientation of the wire in the magnetic field affect the direction of induced current?

The orientation of the wire in the magnetic field plays a significant role in determining the direction of induced current. If the wire is perpendicular to the magnetic field, the induced current will be at its maximum. However, if the wire is parallel to the magnetic field, the induced current will be zero.

5. Can the direction of induced current be reversed?

Yes, the direction of induced current can be reversed by changing any of the factors that determine its direction. For example, changing the direction of motion of the wire, the strength or direction of the magnetic field, or the orientation of the wire in the magnetic field can result in a reversal of the induced current's direction.

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