Help please

Part A (13 points) The figure below shows two closed paths wrapped around two conducting loops carrying currents i1 and i2. What is the value of the integral of B for (a) path 1 and (b) path 2? Part B (12 points) How strong would a magnetic field need to be in order to make a particle of mass 4x10-1l Kg and a charge of 8 nC move in a circular path with a speed of 400 ms and a radius of 0.5m