Question

Question:-

If the length of the material is halved then what will be the change in resistivity..?



Wrong answer will be Reported.....

​

Answer 1

Answer:

New resistance is 8 times the old resistance. If the length is double then the resistance would increase by 8 times. Since R=P*L/A (Resistivity constant) length becomes 2L and area becomes 1/4th.

Resistance when length is l and area is A is R

1

=ρl/A

Now new length is 2l and area is A/2 so new resistance will be

R 2=ρ A/22l

=ρ4l/A=4R 1

So resistance becomes 4 times.

Answer 2

$\huge{ \mathrm{ \star{ \underline{ \underline{ \red{Question}}}}}}$

$\large{ \mathrm{ \bullet{ \: Change \: in \: Resistivity }}}$

$\huge{ \mathrm{ \boxed{ \boxed{ \boxed{ \purple{Answer}}}}}}$

$\large{ \mathrm{ \bullet{ \: = \: No\: Change }}}$

REASON:-

Because Resistivity doesn't depends on length .

______________________________________

$\huge{@itzBrainlyTanuj}$