How does solenoid influence the direction of the current in the wire next to it?

Question

If u have a solenoid with current going through it how do we know what side is north and south and if there is a wire placed next to the solenoid how does the solenoid influence direction of the current in that wire?

Answer 1

Right-Hand Rule: Curl your fingers around the solenoid in the direction that the current is going. The direction your thumb points is the direction of the magnetic flux -- generally agreed upon as "north."
If a wire is placed next to the solenoid, current will only flow through the wire if either the magnetic flux changes (such as with an AC current going through the solenoid), or if you "sweep" the wire through the flux. If you assume an AC circuit and a stationary wire connected to a true resistance (0 induction) near the solenoid, the sinusoidal phase of the induced current in the wire, will be 90 degrees behind that of the solenoid.

Answer 2

To find the direction of the magnetic field in the solenoid wrap the fingers of your right hand around the solenoid with your fingers pointing in the direction that the current flows in. Now stick out your thumb along the axis of teh solenoid. Your thumb points to north.

The wire only sees an induced current if:
1. It has a non-zero cross sectional area
2. The current in the solenoid changes with time.

Otherwise, teh magnitc field has no effect

Answer 3

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