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Physics · PYQ NEET UG 2022

हिन्दी

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:

  1. should be very large and unequal
  2. do not play any significant role
  3. should be approximately equal to 2X
  4. should be approximately equal and are small

Correct answer · Option 4

should be approximately equal and are small

Explanation

A Wheatstone bridge is most sensitive and precise when all four arms have comparable resistances, meaning P and Q should be approximately equal and small.
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