I suggest to please explain concepts as well...why galvanometer reached at null point... Why we consider resistance x instead of R-X, while current is flowing from R-X part of resistor... You're just translating the words of book....
Galvanometer ky Dono points ko negative sy jor dya aysy Galvanometer meter reading nhe prhy ga. Ak point positive dosra Sera negative ho tb read krta hy correct kren