Question

Resistances of three resistors are in the proportion connected in parallel, their effective resistance is 6 Ω. Then connect on. 

36 Ω
84 Ω
66 Ω
18 Ω​

Answer 1

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Answer:

ur answer is in the pic.

Explanation:

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Answer 2

Given:

Resistances of three resistors are in the proportion connected in parallel, their effective resistance is 6 Ω.  

To find:

Resistances of three resistors are in the proportion connected in parallel, their effective resistance is 6 Ω. Then connect on.  

Solution:

From given, we have,

Resistances of three resistors are in the proportion connected in parallel, their effective resistance is 6 Ω.

As it's not given that, 3 resistors have different values, so we consider all the 3 resistors have the same value.

The formula for calculating the resistance of resistors connected in parallel, we get,

1/Rp = 1/R1 + 1/R2 + 1/R3

1/Rp = 1/R + 1/R + 1/R

1/Rp = 3/R

Rp = R/3

6 = R/3

R = 18  Ω

Therefore, option (d) 18 Ω​ is correct.