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NEET 2020
Exam
NEET
Year
2020
Subject
Physics
Chapter
Current Electricity

NEET 2020 · Physics · Current Electricity

A resistance wire connected in the left gap of a metre bridge...

A resistance wire connected in the left gap of a metre bridge balances a 10Ω10Ω resistance in the right gap at a point which divides the bridge wire in the ratio 3:23: 2. If the length of the resistance wire is 1.5m1.5m, then the length of 1Ω1Ω of the resistance wire is:A resistance wire connected in the left gap of a metre bridge balances a 10Ω resistance in the right gap at a point

Options

  1. A1.0×10−1m1.0 \times {10}^{- 1}m
  2. B1.5×10−1m1.5 \times {10}^{- 1}m
  3. C1.5×10−2m1.5 \times {10}^{- 2}m
  4. D1.0×10−2m1.0 \times {10}^{- 2}m

Correct answer

A. 1.0×10−1m1.0 \times {10}^{- 1}m

Step-by-step solution

A resistance wire connected in the left gap of a metre bridge balances a 10Ω resistance in the right gap at a point

R10=l1l2\dfrac{R}{10} = \dfrac{{l}_{1}}{{l}_{2}}

R10=32\dfrac{R}{10} = \dfrac{3}{2}

R=15ΩR = 15Ω

Length of 15Ω15Ω resistance wire is 1.5m1 . 5m

∴∴ length of 1Ω1Ω resistance wire =1.515=0.1= \dfrac{1 . 5}{15} = 0 . 1

=1.0×10−1m= 1 . 0 \times {10}^{- 1}m

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