Find the magnetic field at point P in following cases

Explanation

(i) `(mu_(0)i)/(8r)` into the page
(ii) `(3mu_(0)i)/(8r)` into the page
(iii) `(mu_(0)i)/(2piR) + (mu_(0)i)/(4R)` outside the page
(iv) `(mu_(0)i)/(4R)` out of the page