You are provided with a battery of e.m.f. E, a key K, a voltmeter, a standard resistor R${}_0$ = 2$\mathrm{\Omega }$, a resistance box R, and some connecting wires.
i. Measure and record the e.m.f. E of the battery.
i. Set up a circuit as shown in the diagram above with the key open.
iii. Set the resistance on the resistance box to R 22.
iv. Close the key, read and record the potential difference V on the voltmeter.
v. Evaluate V${}^{-1}$
vi. Repeat the procedures for five other values of R = 5$\mathrm{\Omega }$ 10$\mathrm{\Omega }$,12$\mathrm{\Omega }$,15$\mathrm{\Omega }$ and 20$\mathrm{\Omega }$. In each case, record V and evaluate V${}^{-1}$
vii. Tabulate the results.
viii. Plot a graph with R on the vertical axis and V${}^{-1}$ l on the horizontal axis, starting both axes from the origin (0,0).
ix. Determine the slope, s, of the graph and the intercept c on the vertical axis.
x. Calculate $\propto$ and $\beta$ from the equations s = R${}_0$ $\propto$ and c= - (R${}_0$+B).
xi. State two precautions taken to obtain accurate results.


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