Question

A resistance of 5 `Omega` is connected in the left gap of a metre bridge and 15 `Omega` in the other gap. The position of the balancing point is ____________.

Options

• 10 cm

• 20 cm

• 25 cm

• 75 cm

Answer 1

A resistance of 5 `Omega` is connected in the left gap of a metre bridge and 15 `Omega` in the other gap. The position of the balancing point is 25 cm.

Explanation:

`l/(100 - l) = 5/15 = 1/3`

`3l = 100 - "x"`

`therefore 4l = 100`

`therefore l = 25  "cm"`