Question

Mention the conditions for a balanced wheatstone bridge

Answer 1

BALANCED WHEAT-STONE BRIDGE

When ‘K1’ is connected, no current passes through the galvanometer because K2 is disconnected. When ‘K1’ and ‘K2’ are connected and no current flows through the galvanometer, the condition of bridge is called "Balanced condition". It is possible only when the potential difference between the terminals of galvanometer is zero or potential of point ‘B’ = potential of point ‘D’ i.e.
VB – VD = 0
or
VB = VDR1/R2 = R3/R4
EXPRESSION FOR BALANCED BRIDGE