NECO 2024 PHYSICS ANSWERS (PRACTICAL)

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(1)

NOTE:
1. You must attach this tracing to your number 1 answer sheet
2. You must use pin to open four sides of this your drawing book to look as if you pinned it on a board before u started tracing.
3. You must use pin to open that A point and B point.
4. The red spots u are seeing is where u will open with pin.

(1)

(1)Graph

 

 

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(3aix)
Table of values
E= 3.0v

[TABULATE]
S/N: 1| 2| 3| 4| 5|

L(cm): 10.0| 30.0| 50.0| 70.0| 90.0|

V(v): 2.60| 2.10| 1.90| 1.40| 1.30|

V⁻¹(v⁻¹): 0.385| 0.476| 0.588| 0.714| 0.769

(3ax)

(3axi)
Slope= ∆V⁻¹(v⁻¹)/∆L(cm)
Slope= (0.79 – 0.33)/(85-4)
Slope= 0.46/81
Slope= 0.00568 v⁻¹cm⁻¹

Intercept c = 0.31v⁻¹

(3axii)
K = C⁻¹
K = 1/C
K = 1/0.31
K = 3.23volts

(3axiii)
(i) I ensured tight connections
(ii) I opened the key when reading is not being taken

(3bi)
The electromotive force (EMF) of a cell represents its maximum voltage potential when not connected to a circuit, whereas the potential difference (PD) across the cell is the actual voltage measured when it’s connected to a circuit, taking into account the resistance of the circuit and the cell itself.

(3bii)
E₁ – 1.5r₁ E₂ = 1.5r
E= E₁= E₂= 1.5v
Rₜ= V/I =1.5/0.6=2.5π
¹/rₜ=¹/r₁ + ¹/r₂ = ¹/r + ¹/r => ¹/rₜ = ²/r => rₜ = ²/r

Effective circuit resistance (Rᵣ) = R + rₜ
2.5 = 2+r/2
r/2 = 2.5 – 2
r/2 = 0.5
r=2*0.5
r=1π

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