A meter bridge is set-up as shown, to determine an unknown resistance. X using a standard ohm resistor. The galvanometer shows null point when tapping key is a mark. The end-corrections are and respectively for the ends A and B. The determined value of X is
Step 1. Given data:
Resistance = ohm
Tapping key initial mark =
End-corrections at A and B = and respectively.
Step 2. Finding unknown resistance:
Applying the condition of the balanced Wheatstone bridge, we get
Thus, the correct option is option B.