Question

In the wire shown in segment BC is an arc of a circle with radius 30.0 cm, and point P is at the center of curvature of the arc. Segment DA is an arc of a circle with radius 20.0 cm, and point P is at its center of curvature. Segments CD and AB are straight lines of length 10.0 cm each. 

Part A 

Calculate the magnitude of the magnetic field at a point P due to a current 11.9 A in the wire. Express your answer with the appropriate units. 

Part B 

What is the direction of magnetic field? 

Answer 1