Consider a long wire that makes a right angle (90°) bend as shown in Figure P20.71. If t...

Consider a long wire that makes a right angle (90°) bend as shown in Figure P20.71. If the wire carries a current I, what is the magnetic field at point A? Hint: Use the result for the field from an infinitely long wire (Eq. 20.19) to find the field produced by a “semi”-infinite wire (i.e., half of an infinite wire).