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NEET2022PhysicsCurrent ElectricityActual

A Wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X , the resistances P and Q

Options

  1. Ashould be approximately equal and are small
  2. Bshould be very large and unequal
  3. Cdo not play any significant role
  4. Dshould be approximately equal to 2 X

Correct answer

A. should be approximately equal and are small

Step-by-step solution

For precise measurement of X , value of X should be close to Y . Therefore, resistances P and Q should be equal. If P and Q are large the current in the galvanometer will be small, and it will be difficult to find the null point. Therefore, P and Q should be small.

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