Question

How does the resistance of a wire change when its length is tripled second radius is tripled third material is changed to one whose resistivity is three times?

Answer 1

Answer:

1. Increase by thrice
2. Decreases by 9 times
3. Increase by 3 times

Explanation:

We know that resistance=resistivity*length/area

• When length is tripled then resistance increases to 3times
• When radius is tripled then resistance decreases by a factor of 9.
• When the resistivity is tripled then the resistance increases by 3 times
• When all these changes are simulatneous then the resistance remains the same.

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