Waec 2024 Physics Question 2

(i) Connect R_{x} in the left hand gap of the metre bridge, a length L=100 \mathrm{~cm} of wire in the right hand gap and the other apparatus as shown. (ii) Determine and record the balance point P on the metre bridge wire NQ. (iii) Measure and record L_{x}=\mathbf{N P} and L_{y}=\mathbf{P Q}. (iv) Evaluate R_{1}=\left(\frac{L_{y}}{L_{x}}\right) R_{x}. (v) Repeat the procedure for four other values of L=90 c m, 80 c m, 70 c m and 60 cm. In each case, determine and record the balance point P, and evaluate R_{1}. (vi) Repeat the experiment with the second wire B. Obtain the balance point P and evaluate R_{2} in each case. (vii) Tabulate the readings. (viii) Plot a graph of R_{2} on the vertical axis and R_{1} on the horizontal axis. (ix) Determine the slope, s, of the graph. (x) Evaluate k=\sqrt{s}. (xi) State two precautions taken to ensure accurate results.

(i) State two advantages of potentiometer over voltmeter for measuring potential difference. (ii) Define internal resistance of a cell.