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JEE Main 201910 AprilMorning Shift
Exam
JEE Main
Year
2019
Date
10 April
Shift
Morning Shift
Subject
Physics
Chapter
Experimental Physics

JEE Main 2019 · 10 April · Morning Shift · Physics · Experimental Physics

In a meter bridge experiment, the circuit diagram and the...

In a meter bridge experiment, the circuit diagram and the corresponding observation table are shown in figure.
In a meter bridge experiment, the circuit diagram and the corresponding observation table are shown in figure. S. No.
S. No. R(Ω)R\left(Ω\right) l(cm)l\left(cm\right)

1.
2.
3.
4.

10001000
100100
1010
11

6060
1313
1.51.5
1.01.0

Which of the reading is inconsistent?

Options

  1. A11
  2. B33
  3. C22
  4. D44

Correct answer

D. 44

Step-by-step solution

For meter bridge: Rl=X100−l\dfrac{R}{l} = \dfrac{X}{100 - l}
1→100060=X40⇒X=20003=666.67Ω1 \to \dfrac{1000}{60} = \dfrac{X}{40} ⇒ X = \dfrac{2000}{3} = 666.67Ω
2→10013=X27⇒X=669.23Ω2 \to \dfrac{100}{13} = \dfrac{X}{27} ⇒ X = 669.23Ω
3→101.5=X98.5⇒X=656.67Ω3 \to \dfrac{10}{1.5} = \dfrac{X}{98.5} ⇒ X = 656.67Ω
4→11=X99⇒X=99Ω4 \to \dfrac{1}{1} = \dfrac{X}{99} ⇒ X = 99Ω
Resistance calculated by using data from 4th observation is most inconsistent.
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