Please help me to solve this question...................

Solve the question in three parts (1). At the end of a long inifinite wire. B=(u°i ÷4πr). Outside the page. (2). At the end ofanother long inifinite wire. B=(u°i ÷4πr). Outside the page. (3). At center of a arc B=(u°ix ÷ 4πr) inside the page. For B(at center=0). B(out)=B(in). u°i ÷2πr = u°i÷2πr. x=2 radian. Please do approve my answer if correct.