1. The problem statement, all variables and given/known data A wire loop with radius R is located a distance d from a long straight wire carrying a current I. Find the flux through the loop. 2. Relevant equations B = [itex]\mu[/itex]I/(4[itex]\pi[/itex]) Magnetic Field above wire [itex]\phi[/itex]=B*da*cos[itex]\vartheta[/itex] 3. The attempt at a solution Somehow you have to combine the two equations to find the flux through the circular loop. Any help would be greatly appreciated as I am stumped.