Teaching UKPSC Lecturer Mock Test Series 2024 Physics Current, Resistance and Electricity Wheatstone Bridge
Wheatstone bridge principle is used to measure the specific resistance (S1) of given wire, having length L, radius r. If X is the resistance of wire, then specific resistance is : \(S_1=X\left(\frac{\pi \mathrm{r}^2}{\mathrm{~L}}\right)\). If the length of the wire gets doubled then the value of the specific resistance will be:
1
\(\frac{S_1}{4}\)
2
2S1
3
\(\frac{S_1}{2}\)
4
S1