Electromagnetic Induction / Transformers

[Lennox786]

Homework Statement

A simple transformer is constructed by wrapping wire around opposite ends of an iron rod to form solenoids A and B. Solenoid A is connected to a 12-V battery and a variable resistor, while solenoid B is conncted to an ammeter.
http://f.exoload.com/507/homework.jpg

A. If current through solenoid A is increased, how will the magnetic flux through the iron rod be affected. Support your answer with a diagram.

B. Determine the direction of the induced magnetic field in solenoid B if the current in solenoid A is increased. Support with a diagram.

Homework Equations

The Attempt at a Solution

A) Nothing in my notes is like this. I don't know what it means by magnetic flux. By using the second left hand rule, I figured out that the right side is north pole, and the left side is south pole.

B) Again, i can use the second left hand rule, but I don't know what would be changed if the current was increased in solenoid A.

 

[ranger]

Simply stated, magnetic flux are lines of force representing the magnetic field. The more concentrated the flux, the stronger the field.

How is the magnetic field affected by the core of the solenoid? Hint: think about the formula to find the strength of the magnetic field of a solenoid.

Is that the diagram you drew, or was it given to you?