Waec 2021 Physics Questions and Answers Expo

(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

(bi)

(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

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