NECO 2024 PHYSICS(PRACTICAL) ANSWERS

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

L(cm): 10.0| 20.0| 30.0| 40.0| 50.0|

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