how does the resistivity of wire change when its lenght ia doubled?
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Answer:
Resistance of wire increases by four times.
Explanation:
Resistance of wire is proportional to length and inversely proportional to area.
Area′×Length=Volume
⟹Area=V/L
Volume of wire is always constant.
As length is doubled,
Area×(2L)=V
⟹Area=V/2L⇒ Area is halved.
So, R1=ρL1/A1
⟹R2=ρ(2L)/(A/2)=4ρL/A
Resistance of wire increases by four times.
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Answer:
will be four times
Explanation:
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