QUESTION 1
You are provided with the following apparatus:
- Ammeter
- Voltmeter
- Mounted resistance wire labeled W
- A new dry cell
- A cell holder
- 8 connecting wires
- A switch
- A jockey
- Micrometer screw gauge (to be shared)
PART A
PROCEED AS FOLLOWS:
- Connect your apparatus as shown in the figure
- Place the jockey at L=10cm, close the switch S. Read and record the current and the P.d readings.
Current (I) =……………A (1/2mk)
P.d (V) =………………….V (1/2mk) - Repeat the procedure in (b) for other values of L, and complete the table below. (5mks)
length L(cm)
10
15
20
25
30
35
P.d.(V)
Current I(A)
- Plot a graph of p.d (V) against current (I) in the graph paper provided. (5mks)
- Determine the slope S of the graph (3mks)
- Given that the relationship between p.d (V) and current (I) supplied from the cell is given by the equation E=V+Ir, use your graph to determine the values of
E=………………… (1mk)
r=………………… (1mk)
PART B
Re-arrange the apparatus as show below
- Close the switch S and record the current, (I) and the P.d (V) readings.
I=………………………A
V=………………………V (1mk) - Use your values in (f) above to calculate the resistance R, of the wire, W.
R=………………Ω (1mk) - Measure the diameter d of the wire, W, using a micrometer screw gauge. Give your answer in SI units.
d=…………………. (1mk) - Given that R= 4Ɓ/(πd^2 ), find the value of Ω for the wire W. (1mk)
QUESTION 2
You are provided with the following apparatus:
- A 250cm3 glass beaker
- A candle
- A metre rule
- White screen
- Water
PROCEED AS FOLLOWS:
- Set up the apparatus as shown in the figure below.
- Put about 200cm3of water into the beaker. Measure the height, h of the water above the base of the beaker.
- Given the internal radius, r of the beaker is given by the relation r=√(100/h) . Find the value of r.
r =……………cm (2mks) - Adjust the position of the screen until a sharp image is formed on the screen.
Read and record the corresponding values of U and V In the table below. Given that U = 10r, 9r, 8r… (8mks)
10r
9r
8r
7r
6r
5r
4r
3r
U (cm)
V(cm)
- Plot a graph of u against v. (5mks)
- Determine the slope at 6r. (3mks)
MARKING SCHEME
PART A
L(CM) |
10 |
15 |
20 |
25 |
30 |
35 |
P.d (V) |
1.00 |
1.10 |
1.15 |
1.20 |
1.25 |
1.30 |
I(A) |
0.40 |
0.32 |
0.28 |
0.24 |
0.20 |
0.16 |
QUESTION 2
H=3.0 cm
r=5.77cm
10r |
9r |
8r |
7r |
6r |
5r |
4r |
3r |
|
U(cm) |
17.3 |
22.8 |
28.7 |
33.8 |
39.3 |
44.8 |
50.3 |
54.1 |
V(cm) |
16.9 |
13.7 |
11.9 |
11.7 |
10.7 |
10.2 |
10.1 |
10.0 |
Gradient of tangent at 6r
Slope = change in y /change in x
Answer without unit
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