Question

resistance wire made from German Silver has resistance 4.25 ohm calculate resistance of another wire of same material such that its length increase by 4 time and area decreased by 3 time

Answer 1

....hey!!here is your answer........

Answer 2

Answer:

The resistance of the second wire is 51 ohm

Explanation:

Given that, the resistance of garman silver is R1=4.25 ohm.

Let the length of the wire is L1=l

And the area of the wire is A1=a

For the second case R2 and which is unknown.

The lenght of the second wire is L2=4l (as given that the length of the wire is 4times of the first wire's length)

The area of the second wire is A2=a/3

So now we can say that,

(R1.A1)/L1=(R2.A2)/L2

=>R2/R1=(4l/l).(a/(a/3))

=>R2/4.25=12

=>R2=12x4.25

=>R2=51 ohm

The resistance of the second wire is 51 ohm