In a meter bridge two balancing resistances are $30\Omega$ and $20\Omega$. If galvanometer shows zero deflection for the jockey's contact point P. Then find the length A.P. (A) 70 cm (B) 60 cm (C) 40 cm (D) 30 cm
In a meter bridge two balancing resistances are $30\Omega$ and $20\Omega$. If galvanometer shows zero deflection for the jockey's contact point P. Then find the length A.P.
(A) 70 cm
(B) 60 cm
(C) 40 cm
(D) 30 cm