Question

length increases by 4 time and radius decrease by half then new resistance is​

Answer 1

Answer:

If the length of the wire is doubled and its area of cross section is decreased to half, then its resistance

A .

Will increases 4 times

B .Will become double

C .Will remain the same as before

D .Will become half the initial value

MediumWe know

R= ρ

A

l

R

1

ρ

2

A

2l

= ρ

A

4l

= 4R

Answer

Step-by-step explanation:

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Answer 2

Answer:

l`= 4l

R'= 1/2 R

Then the new resistance is 4R