2021 WAEC PHYSICS PRACTICAL ANSWERS

2021-WAEC-PHYSICS-PRACTICAL-ANSWERS⇓

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PHYSICS-PRACTICAL-ANSWERS

(1)

(1x)

Graph

SCALE OF VALUE

VERTICAL AXIS = 4cm to 0.1 unit
HORIZONTAL AXIS = 2cm to 20 units

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(3av)
Tabulate

S/N ||1 || 2 || 3 || 4 || 5

d(cm) || 80.00|| 70.00 || 50.00 || 40.00 || 30.00

I(A) || 0.30||0.35 || 0.40|| 0.45||0.50 ||

(I)^-¹ ||3.333 ||2.857 ||2.500 || 2.222||2.000 ||

(3avii)
from the graph, Slope s, = ∆d/∆I^-¹
= 71 – 20 ÷ 3 – 1.75
= 51/1.25
= 40.8cmA
Or 0.408Am

(3aviii)
(i) I ensured tight connections
(ii) I avoided error due to parallax while reading the ammeter

(3bi)
(i) Straight at the magnetic field
(ii) The number of turns of it’s coils

(3bii)
Given:
Diameter d, = 0.6cm = 6×10^-³m
Resistivity, e = 1.0×10^-6 Ωm
Resistance R = 4Ω

Using R = eL/A
L=RA/e
= Rπd²/4e
= 4 × 22/7 × 36 × 10^-6 ÷ 4 × 1 × 10^-⁶
= 22/7 × 36
= 113.14m
:. L = 113.14metres

(3a)

 

(3b)

(3iv)
Graph

SCALE OF VALUE

Vertical axis = 2cm to 10 units
Horizontal axis = 4cm to 1 unit

 

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