# The Right Hand Rule: Direction of Ring Induced Current in Solenoid

• laminatedevildoll
In summary, the direction of the induced current in the ring is the opposite of the direction of the magnetic flux when the switch is initially turned on.
laminatedevildoll
If a metal ring is places near a solenoid, what is the direction of the induced current in the ring for the following cases

a. At the instant the swithc in the circuit containing the solenoid is thrown closed.

b. After the switch has been closed for several seconds.

c. At the instant the switch is thrown open.

I think that I have to do the right hand rule for this problem, but my problem is that I have a hard time understanding the right hand rule, so is there any way of finding the direction for something other than the right hand rule? How about the dot product? For instance, what does "into the page" and "out of the page" mean?

this looks like a Lenz's law problem. Basically you have zero current to begin with. Lenz's law states that the induced current in a object will be in a direction so that the initial state of current is maintained. Kinda like angular momentum. So if I have zero current to begin with, then the instant after I throw the swtich the direction of the current will oppose that of the solenoid. So if the current flows clockwise in the solenoid, it will flow counter-clockwise in the ring. When the solenoid is turned off, then as the clockwise current in the solenoid approaches zero, the current in the ring will become less counter-clockwise and will want to tend towards a clockwise direction.

For the case where the switch has been closed for "several seconds," why is the mention of those "several seconds" so important to the problem?

For the case where the switch has been closed for "several seconds," why is the mention of those "several seconds" so important to the problem?

because as the switch is intially turned on the change in magetic flux causes the induced current. but once the switch has been turned on for several second the induced current will be no longer because after those several second there is no more CHANGE in magnetic flux.

at least that what i think!

## 1. What is the right hand rule?

The right hand rule is a method used to determine the direction of a magnetic field created by a current-carrying wire or the direction of an induced current in a coil. It is based on the principle that the magnetic field lines around a wire or coil form circles, and the direction of the magnetic field can be determined by the direction of these circles.

## 2. How is the right hand rule applied to a solenoid?

To apply the right hand rule to a solenoid, you can imagine your right hand gripping the solenoid with your fingers curled around it in the direction of the current flow. Your thumb will then point in the direction of the magnetic field lines inside the solenoid, and your fingers will show the direction of the induced current in the coil.

## 3. What is the direction of the induced current in a solenoid?

The direction of the induced current in a solenoid is determined by the right hand rule. If the magnetic field lines inside the solenoid are going in the clockwise direction, then the induced current will flow in the counterclockwise direction. If the magnetic field lines are going in the counterclockwise direction, then the induced current will flow in the clockwise direction.

## 4. How does the number of turns in a solenoid affect the direction of the induced current?

The number of turns in a solenoid does not affect the direction of the induced current. The direction of the induced current is solely determined by the direction of the magnetic field lines inside the solenoid.

## 5. Can the right hand rule be used for other situations besides a solenoid?

Yes, the right hand rule can be used for other situations besides a solenoid. It can be used to determine the direction of a magnetic field created by a current-carrying wire, the direction of an induced current in a coil, and the direction of a force on a charged particle moving in a magnetic field.

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