Question

A resistance wire made from German
silver has a resistance of 4.25 0.
Calculate the resistance of another wire,
made from the same material, such
that its length increases by four times
and area of cross-section decreases by
three times.​

Answer 1

Answer:

resistance of wire will be 51 ohm.

Explanation:

we know, resistance =p×l/a

so, given resistance is 4.250 ohm

4.250= p×l/a

p=4.250×a/l

resistance of another wire whose length is increased by 4 times and area is decreased by 3 times= p×l/ a

where p= 4.250×a/ l

so, r=4.250×4 l× 3/l×a

r= 51 ohm

hence resistance of another wire will be 51 ohm..

(( hope it will help u))