Discussion :: Series-Parallel Circuits - General Questions (Q.No.9)
A certain Wheatstone bridge has the following resistor values: R1 = 10 k, R2 = 720 , and R4 = 2.4 k. The unknown resistance is
Answer: Option D
No answer description available for this question.
|Lavanya said: (Mar 4, 2011)|
|Ramu said: (Jun 10, 2011)|
|This will ans is correct but procedure is wrong.
Wheat stone bridge Rx= (R2/R1) *R3.
|Anand said: (Jul 27, 2011)|
|Sai said: (Aug 5, 2011)|
|I agree with you anand.|
|Tamilarasan said: (Aug 11, 2012)|
|In a wheatstone bridge the ratio is equal (i.e. R1*R2=R3*R4).
So R2=R3*R4/R1. Sub the value. We will get the answer.
|Keerthi said: (Oct 28, 2013)|
|Here Rv means R1 or R3?|
|Meenakshi said: (Feb 15, 2014)|
|Here Rv means variable resistance i.e., generally R3.
Formula R4 = R2R3/R1, but here R4 is given, we have to fnd R1, so eqn becomes R1 = R2R3/R4.
Therefore R1 = 720*10k/2.4K = 3000 ohms.
|Ankit Tiwari said: (May 27, 2014)|
|Normal formula apply here R1/R2 = R3/R4.|
|Mahe said: (Jun 29, 2014)|
|In wheatstone bridge product of two opposite resistors is equal to the another product. Here R1 R2 and R3 wherever we can mention. So these kind of problems we need a circuit or figure.|
|Nouman said: (Dec 3, 2014)|
|@Meenakshi : How do we find R1 ? when its already been given in the question.|
|Ravi said: (May 9, 2015)|
|Formula: R1*R2 = R3*R4.
Therefore R3 = (R1*R2)/R4.
= (10k*720)/2.4 k.
= 3000 ohms.
|Roopesh D M said: (Jun 17, 2015)|
|Data is insufficient. Because we get different values of resistance depends on the bridge circuit.
We can take R1*R2 = R3*R4.
Or R1*R3 = R2*R4.
Or R1*R4 = R2*R4.
In each case we get different values, so without circuit we can't decide the unknown resistance value.
|Chetan said: (Jun 25, 2015)|
|In wheatstone bridge product of two opposite resistors is equal to the another product.
R1, R2, R4 are given, we need to find R3.
R3 = R1*R2/R4 = 10K*720/2.4K = 3000.
|Piya said: (Jun 27, 2015)|
|But in wheatstone bridge: R2/R1 = R4/R3.|
|Parneet Kaur said: (Jul 9, 2015)|
Your formula is wrong. The correct formula is r1*r2=r3*r4.
|Megha said: (Jul 16, 2015)|
|Vijay said: (Oct 16, 2015)|
|R1*R2 = R3*R4.
There for R3 = (R1*R2)/R4 720 ohm = 0.72 k ohm.
10k ohm*0.72k ohm/2.4k ohm.
3k ohm = 3k*1000.
Answer: 3000 ohm.
|Puja said: (Jan 11, 2017)|
|But, If we apply the formula R1/R2 = R3/R4 then answer is different from the answer of R1* R2= R3 * R4 formula. Please explain me again which method is right.|
|Aditya said: (Oct 22, 2017)|
|No, the correct answer is 33.3kohm.|
|Jagan said: (Apr 12, 2018)|
|I am not getting it. Please explain it.|
|Mari Raj said: (Nov 11, 2018)|
|Unknown resister R3=(R1/R2)*R4.
So, R3 = 33.3kohm.
|Hardiksinh said: (Mar 11, 2019)|
|Yes, R3 = 33.33, because the formula is R1R4=R2R3. Then R3= R1R4/R2.|
|Darshil said: (Jul 29, 2019)|
|The correct formula is R1/R2 = R3/R4.
So the answer comes 33.3kOhm.
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