# What is the direction of the induced current in the loop for each situation?

• ugobroncs3343
In summary, the conversation is discussing a problem with determining the direction of magnetic flux through a loop using Lens Law. The initial direction of the flux must be established before analyzing how it is changing in order to determine the direction of the induced current. The examples being discussed are numbered 1-5, with 4 being the focus of the conversation.
ugobroncs3343

## Homework Statement

THe problem is number 3 in the picture.

## The Attempt at a Solution

Lens law changing magnetic flux through the loop not sure which way for each one little confused. Thank you

#### Attachments

• 2012-04-18_11-29-57_736.jpg
34.6 KB · Views: 440
ugobroncs3343 said:

## Homework Statement

THe problem is number 3 in the picture.

## The Attempt at a Solution

Lens law changing magnetic flux through the loop not sure which way for each one little confused. Thank you

Clearly in situation 4, the field threading the loop is into the page - as signified by the crosses.

First step would be to establish the direction of the flux threading the loops in the other 4 examples. - ie into the page or out of the page.

Once you have established the direction of the flux to start with, we can analyse how that flux is changing; and thus the direction of the induced current.

SO get back with those initial B directions.

I see the examples as
1. top left
2. top right
3. lower left
4. lower centre
5 lower right

Just so we know we are referring to the same example each time.

## 1. What is the direction of the induced current when the loop is moved towards a north pole?

The induced current in the loop will flow counterclockwise, creating a magnetic field that opposes the change in flux caused by the approaching north pole.

## 2. How does the direction of the induced current change when the loop is moved away from a south pole?

The direction of the induced current will reverse and flow clockwise, still opposing the change in flux caused by the moving away from the south pole.

## 3. In which direction does the induced current flow when the magnetic field through the loop is increased?

The induced current will flow counterclockwise, creating a magnetic field that opposes the increase in magnetic field through the loop.

## 4. How does the direction of the induced current change when the magnetic field through the loop is decreased?

The induced current will reverse and flow clockwise, still opposing the decrease in magnetic field through the loop.

## 5. What is the direction of the induced current when the loop is rotated in a uniform magnetic field?

The direction of the induced current will depend on the orientation of the loop and the direction of the magnetic field. The induced current will always flow in a direction that opposes the change in flux caused by the rotation of the loop.

• Introductory Physics Homework Help
Replies
1
Views
1K
• Introductory Physics Homework Help
Replies
8
Views
705
• Introductory Physics Homework Help
Replies
2
Views
558
• Introductory Physics Homework Help
Replies
3
Views
1K
• Introductory Physics Homework Help
Replies
12
Views
416
• Introductory Physics Homework Help
Replies
1
Views
244
• Introductory Physics Homework Help
Replies
5
Views
1K
• Introductory Physics Homework Help
Replies
9
Views
1K
• Introductory Physics Homework Help
Replies
2
Views
2K
• Introductory Physics Homework Help
Replies
0
Views
229