Question

a piece of wire of resistance R is cut into five equal parts. These five parts are then connected in parallel. If the equivalent resistance of this combination is R', then the ratio R/R' is --- a) 1/25; b) 1/5; c) 5; d) 25.​

Answer 1

Step-by-step explanation:

R' = R/25

R/R' = 25

USE FORMULA

Req = R/n {in parallel}

Answer 2

Answer:

Step-by-step explanation:

Resistance of a piece of wire is proportional to its length. A piece of wire has a resistance R. The wire is cut into five equal parts.

Therefore, resistance of each part =R/5

All the five parts are connected in parallel.

∴equivalent resistance (R') is given as-:

1/R' = 5/R+5/R+5/R+5/R+5/R

1/R' = 25/R

R/R' = 25