You are provided with a retort stand with its accessories, two pieces of wood, a thread, pendulum bob, stop watch and a meter rule. (a) Hang the pendulum bob on one end of a 90 cm length of thread and clamp the other end firmly between two small pieces of wood as shown in Figure 1. (b) Displace a pendulum bob to a small distance and release it such that, It begins to swing to and fro motion. Determine the time t for twenty (20) complete oscillations and hence the corresponding periodic time, T. (c) Repeat the procedures in 1 (b) for the values of L=70 cm, 50 cm, 30 cm and 10 cm.

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You are provided with a resistance box R, a dry cell E, a switch S, a jockey J and a centre- zero galvanometer. Determine the value of the unknown resistance X by means of a metre bridge as follows: (a) Set up the circuit as shown in Figure 2. (b) Set R =1Ω, close the switch, slide the jockey over the metre bridge wire until the galvanometer reads zero. Read and record the length $L_1$. Also read and record the corresponding length $L_2$. (c) Repeat the procedures in 2 (b) for values of R = 2Ω, 3Ω, 5Ω and 7Ω and record the values for $L_1$ and $L_2$ in each case.

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