Solve Electromagnetics Q: Magnetic Field Strength @ Point P

[spacemanrussell]

Homework Statement

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Hey this one is really stumping me.

http://session.masteringphysics.com/problemAsset/1002455/6/knight_Figure_32_52.jpg
What is the strength of the magnetic field at point P in the figure?

Homework Equations

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[Kurdt]

Welcome to physics forums! It is the policy of this forum that students show their work to problems they are seeking help with. This helps you to learn and the helpers identify how best to help you.

The biot-savart law seems a good place to start.