Find an expression for the strength and direction of the magnetic field B⃗ .?

In the following figure, a long, straight, current-carrying wire of linear mass density μ is suspended by threads. A magnetic field perpendicular to the wire exerts a horizontal force that deflects the wire to an equilibrium angle θ. A) Find an expression for the strength and direction of the magnetic field B⃗... show more In the following figure, a long, straight, current-carrying wire of linear mass density μ is suspended by threads. A magnetic field perpendicular to the wire exerts a horizontal force that deflects the wire to an equilibrium angle θ.

A) Find an expression for the strength and direction of the magnetic field B⃗ .

B= ???


B) What B⃗ deflects a 51 g/m wire to a 13 ∘ angle when the current is 9.0 A ?

B= ???

I know the field is down.
Update: https://session.masteringphysics.com/problemAsset/2310373/2/P-32.71.jpg
Forgot the Imagie
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