Question

III. Choose the correct answer. choose the correct answer 1. When we increase the thickness of a conducting wire a. heating effect increases b. heating effect decreases c. no change in heating effect d. no flow of current

Answer 1

Answer:

➡️1.Heating affect DECREASES...⬅️

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Answer 2

Answer:

(b) Heating effect decreases

Explanation:

$R \alpha \frac{L}{A} -(1)$

R - Resistivity

L - Length of Conductor

A - Area of Cross Section (In this case - π r²)

When we increase the thickness of wire, its cross section area increases which means A increases. When A increases then resistivity will decrease becaue as per relation (1): Resistivity is inversely proportional to Area.

Now when the resistivity will decrease, Heat will also decrease because $H\alpha R$.

H - Heat/Temperature

R - Resistivity