# How Does the Resistance of a Wire Change When: Its Length is Tripled? - Science

How does the resistance of a wire change when:

its length is tripled?

#### Solution

Resistance,

R=l/A
where l = length of  wire
A= area of cross-section of the wire

When the length is tripled, l' = 3l

New resistance,

R'=l/A

R'=(rho(3l))/A=(3l)/A

R=3R

R=P/A

Thus, the resistance will become three times the original resistance.

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#### APPEARS IN

Lakhmir Singh Class 10 Physics (Science)
Chapter 1 Electricity
Q 22.1