Resistance between two opposite faces of square thin film of area 1 mm2 having thickness of1 μm if resistivity of material is 10 6 Ω will be:A) 1000 Ω C) 1 ΩB) 100 Ω D) 10 ΩQ.18 Total resistance between ‘A’ and ‘B’ in the given circuit is:5 ΩA5 Ω 5 Ω 5 ΩBA) 5.6 Ω C) 0.33 ΩB) 3.33 Ω D) 6.6 ΩA B6 Ω 6 Ω 6 Ω
Question
Resistance between two opposite faces of square thin film of area 1 mm2 having thickness of1 μm if resistivity of material is 10 6 Ω will be:A) 1000 Ω C) 1 ΩB) 100 Ω D) 10 ΩQ.18 Total resistance between ‘A’ and ‘B’ in the given circuit is:5 ΩA5 Ω 5 Ω 5 ΩBA) 5.6 Ω C) 0.33 ΩB) 3.33 Ω D) 6.6 ΩA B6 Ω 6 Ω 6 Ω
Solution
Para resolver la primera parte de la pregunta sobre la resistencia de una película delgada cuadrada, utilizamos la fórmula de la resistencia:
donde:
- es la resistencia,
- es la resistividad del material,
- es la longitud del material,
- es el área de la sección transversal.
Dado que la película es cuadrada con un área de y un grosor de :
-
Convertimos las unidades a metros:
- Área
- Grosor
-
La longitud es el grosor de la película, ( L = 1 \times 10^{-6} , \text
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