Figure `29-56` shows two current segments. The lower segment carries a current of `i_(1)=0.40` A and includes a semicircular are with radius `5.0` cm, angle `180^(@)` and center point P. The upper segment carries current `i_(2)=3i_(1)` and includes a circular are with radius `4.0` cm, angle `120^(@)` and the same centre point P. What are the (a) magnitude and (b) diretion of the net magnetic field `vecB` at P for the indicated current directions ? What are the (c ) magnitude and (d) direction of `vecB` if `i_(1)` is reversed ?

Answer

`(a)3.8muT;(b)into;(c )8.8muT;(d)into