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NEET2026PhysicsChapterActual

In a modified meter bridge experiment to find an unknown resistance S , a standard resistance of 24 is connected in the left gap and S is connected in the right gap. The cell and galvanometer connections are interchanged as shown in the figure: the cell is connected between the central terminal and the jockey, and the galvanometer is connected across the ends A and B of the wire. If the galvanometer shows null deflec

Options

  1. A16
  2. B36
  3. C60
  4. D9.6

Correct answer

B. 36

Step-by-step solution

The given circuit can be modeled as a Wheatstone bridge. Let the ends of the meter bridge wire be A and B , the central terminal be C , and the position of the jockey be J . The four arms of the bridge have the following resistances: Resistance between A and C , R_ AC = 24 Resistance between C and B , R_ CB = S Resistance of wire segment AJ , R_ AJ 40 cm Resistance of wire segment JB , R_ JB (100 - 40) cm = 60 cm The cell is connected between nodes C and J , and the galvanometer is connected between nodes A and B .

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