Question

ELECTRICITY
GIVE THE ANSWER FOR 1 MARK QUESTIONS :
given length of a wire is doubled of itself and this process is repeated once again. By what factor does
the resistance of the wire changes?
A​

Answer 1

Answer:

By 4 times

Explanation:

The length of the Wire is doubled 2 times. hence its 4 times its original valu.

Resistance = ρl/A, where l is the length and A is the Area

                   

If the Length is doubled and the Area is constant and we know that Resistivity is the same.

so

R₁ =  ρl₁/A  

R₂ =  ρl₂/A

Then R₂ = 4 R₁