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11thHeaven
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Homework Statement
A long solenoid with 10 turns per cm and a radius of 7 cm carries a current of 20mA. A current of 6 A flows in a straight conductor located along the central axis of the solenoid.
Homework Equations
(a) At what radial distance from the axis will the direction of the resulting magnetic field be at 45° to the axial direction?
The Attempt at a Solution
I really don't know where to start here. The only two equations our lecturer has spoken of are B=(u0I)/(2∏r) for the magnetic field around a conducting wire, and B=Nu0I for the magnetic field strength around a solenoid. I can work out the magnetic field strength due to each, but no idea where to start finding out what the "direction" of the resulting magnetic field will be.
Help appreciated! :)