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Physics · Karatasi 2C · 2022

3 maswali

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Maswali (3)

Sehemu C

1. 0 alamas

Mchoro wa swali 1
(i) Tabulate the results of $x$ (in cm) and $y$ (in cm). 5 alama
(v) State the physical significance of z. 0 alama
(ii) Plot a graph of $y$ against $x$. 8 alama
(vi) State the aim of doing this experiment. 0 alama
(iii) Determine the slope of the graph. 6 alama
(iv) Calculate the value of $z$ from your experimental results given that, 6 alama

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2. 0 alamas

Determine the resistivity of the material of the wire provided from the following procedures: (a) Use the micrometre screw gauge to determine the diameter of the given wire and hence find its cross section area in m$^2$. Connect the circuit as shown in Figure 26 where C is a crocodile clip. Measure the length of wire L = 100 cm and clip it so that the current flows across the wire. Record the voltmeter reading V. (b) Repeat the procedures in 2 (a) with crocodile clip at L = 80 cm, 60 cm, 40 cm and 20 cm. Record the corresponding voltmeter reading in each case. (The length L should be in metres).

Mchoro wa swali 2
(a) Use the micrometre screw gauge to determine the diameter of the given wire and hence find its cross section area in m$^2$. Connect the circuit as shown in Figure 26 where C is a crocodile clip. Measure the length of wire L = 100 cm and clip it so that the current flows across the wire. Record the voltmeter reading V. 0 alama
(b) Repeat the procedures in 2 (a) with crocodile clip at L = 80 cm, 60 cm, 40 cm and 20 cm. Record the corresponding voltmeter reading in each case. 0 alama
(i) Tabulate the values of L, V, and $\frac{1}{L V}$. (The length L should be in metres). 0 alama
(ii) Plot a graph of $V^{-1}$ against $L^{-1}$. 0 alama
(iii) Determine the slope S. 0 alama
(iv) Find the value of $\frac{1}{V}$ for which $\frac{1}{L} = 0$ and state its physical meaning. 0 alama
(v) Determine the value of resistivity of the wire given that, $\frac{1}{V} = \frac{1}{\rho E} + \frac{A}{L E}$. 0 alama

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