Question

In a meter bridge experiment the resistance of resistance box is `16 Omega` which is inserted in right gap The null point is obtained at 36cm from the left end the least count of meter scale is lmm What is the value of unknown resistence ?( Error = L.C or L.C /2 )
A. `9 pm 5/128 Omega`
B. `9pm 5/256 Omega`
C. `9pm 5/512 Omega`
D. `128/9 pm 1/2560 Omega`

Answer 1

Correct Answer - B
` x/16= 36/64 = 9 Omega`
`dx/x= dl/l(i-l) =0.5xx10^(-1)/36xx64`
`dx = 0.05 xx 9/36xx64 = 1/5120 Omega`
` x=9 pm 1/5120 Omega`