For a post office box with ratio arms P : Q = 10 : 1 , the galvanometer deflection is + 4 divisions when the resistance in the third arm is 200 Ω and − 2 divisions when it is 212 Ω , varying linearly

Question

For a post office box with ratio arms P : Q = 10 : 1 , the galvanometer deflection is + 4 divisions when the resistance in the third arm is 200 Ω and − 2 divisions when it is 212 Ω , varying linearly in between. The unknown resistance is

TestHub · Accepted Answer

Interpolating linearly between + 4 divisions at 200 Ω and − 2 divisions at 212 Ω : R = 200 + 12 × 6 4 ​ = 208 Ω Q P ​ = 10 X = ( P Q ​ ) R = 10 208 ​ = 20.8 Ω

Physics - Current Electricity Question with Solution | TestHub

Options:

Doubts & Discussion