Question

Out of two wires p and Q shown in figure,which one has greater resistance? justify it. ​

Answer 1

Answer:

The wire Q will have greater resistance

Explanation:

we know that R=ρ$\frac{l}{A}$

so for same length resistance is inversely proportional to area

Here, P has more area, so less resistance

Q has less area so more resistance

hope it helps

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Answer 2

Answer:

Q has a greater resistance

Explanation:

P is more thick, so when hot liquid say H2O will be put on it, some part of the wire will expand and the other part will remain same, and when cold h2o will be thrown on it, some layers of it will contract and the other layers will remain in same which will lead to cracks on it.

Q is more thin so when hot H2O will be thrown on it, the whole wire will expand and when cold H2O will be thrown on it, the whole wire will expand. So there will be no cracks