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Question:

A meter bridge is set-up as shown, to determine an unknown resistance X using a standard 10 ohm resistor. The galvanometer shows null point when tapping-key is at 52 cm mark. The end-corrections are 1 cm and 2 cm respectively for the ends A and B. The determined value of ‘X’ is:?

10.6 ohm

11.1 ohm

10.2 ohm

10.8 ohm

Solution:

Balancing the circuit , X × (48 + 2) = 10 × (52 + 1)
X = 530/50 = 10.6 ohms