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A pieces of wire of resistance Ris cut into five equal parts these parts are then connected in parallel if the equivalent resistance of this combination is R' then the ratio R/R' is 1/5

Posted by Abhijith Su 5 years, 6 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 6 months ago

Wire is cut into 5 equal parts. Since all dimensions are same for pieces, Resistance of each wire is equal and has a value = R/5.

Resistance is proportional to length of wire and inversely proportional to area of cross-section. IF length is 1/5th, then Resistance is also 1/5 th of original value.

When these five are connected in parallel combination, then net resistance becomes 1/5th again. So R1 = R/5 * 1/5 = R/25

Ratio = R1/R = 1/25

0Thank You

Abhijith Su 5 years, 6 months ago

1/5 is the answer

0Thank You

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CBSE > Class 10 > Science