Question

Two wires that are made of same material have length in ration 4:3 and area of cross sectoion om ratio 5:4. When wires are connected in parallel across a voltage source , the ratio of current flowing through them is ____

Answer 1

Explanation:

Let the length two wires is 4x and 3x

area of cross section is 5x and 4x

material are same that resistivity is same

then,

R1 of first wire = P×L/A = 4x/5x =4/5 = 0.75 ohm

R2 of second wire= p×ĺ/À= 3x/4x = 3/4= 0.80 ohm

they connect in parallel then voltage is same.

current in first wire = V/R1 = V/0.75 ampere.

current in second wire= V/R2=V/0.80 ampere

NOW RATIO OF CURRENT IS

V/R1÷V/R2

R2/R1

0.80/0.75

16/15

RATIO OF CURRENT IS 16:15

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Answer 2

Answer:

16 : 15

Explanation:

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