Question

The wire AB of slide wire bridge 68 is 400 cm long. Where should the jockey J whose one end connected to galvanometer,the other end can be connected to AB, so that galvanometer shows no deflection ?

Answer 1

Let the galvanometer shows no deflection when
`AJ = 1 cm`. Therefore, `BJ = (400 - l)`.
For balanced bridge, `8/12 = l/((400 - l))`
On solving, `l = 160 cm`