Question

In a metre bridge experiment, the ratio of the left-gap resistance to right gap resistance is 2: 3. The balance point from the left is ______.

Options

• 60 cm

• 50 cm

• 40 cm

• 20 cm

Answer 1

In a metre bridge experiment, the ratio of the left-gap resistance to right gap resistance is 2: 3. The balance point from the left is 40 cm.

Experiment:

`2/3` = `l/(100-l)`

`therefore  2(100-l) = 3l` 

`therefore  l = 200/5` = 40 cm