CSEE
Physics · Paper 2C · 2022
3 questions 🇹🇿 NECTA ✓ Official NECTA answers
CSEE
🇹🇿 NECTA
✓ Official NECTA answers
Physics · Paper 2C · 2022
3 questions
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Questions (3)
Section C
1.
0 marks
(i)
Tabulate the results of $x$ (in cm) and $y$ (in cm).
5 mk
(v)
State the physical significance of z.
0 mk
(ii)
Plot a graph of $y$ against $x$.
8 mk
(vi)
State the aim of doing this experiment.
0 mk
(iii)
Determine the slope of the graph.
6 mk
(iv)
Calculate the value of $z$ from your experimental results given that,
6 mk
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2.
0 marks
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).
(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 mk
(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 mk
(i)
Tabulate the values of L, V, and $\frac{1}{L V}$. (The length L should be in metres).
0 mk
(ii)
Plot a graph of $V^{-1}$ against $L^{-1}$.
0 mk
(iii)
Determine the slope S.
0 mk
(iv)
Find the value of $\frac{1}{V}$ for which $\frac{1}{L} = 0$ and state its physical meaning.
0 mk
(v)
Determine the value of resistivity of the wire given that, $\frac{1}{V} = \frac{1}{\rho E} + \frac{A}{L E}$.
0 mk
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