Question

A metallic conductor with resistance 'R' is divided into 3 equal parts. Afterwards these parts are connected in parallel. Its total resistance is R'. Then R : R' is *
1 point
A) 1 : 3
B) 9 : 1
C) 1 : 9
D) 3 : 1​

Answer 1

R IS DIVIDED INTO THREE EQUAL PARTS SO,

EACH PART IS R/3

NOW, THREE RESISTANCE OF R/3 ARE CONNECTED IN PARALLEL

SO,

3/R+3/R+3/R=1/R` ( R` is equivalent resistance in parallel connection )

!!hope you know this formula!!

9/R=1/R`

R`=R/9

therefore,R:R`=R:R/9

=9:1

hope it helps

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