Question

The value of R for which deflection in galvanometer g is zero​

Answer 1

Answer:

1 ohm

Explanation:

hope gonna help you

Answer 2

Given:

Galvanometer shows zero deflection.

To Find:

Resistance of R.

Solution:

When the galvanometer shows zero deflection, no current flows through the circuit and it is a balanced wheat stone bridge.

$\frac{2}{10} = \frac{ \frac{4r}{4 + r} }{4}$

$\frac{4}{5} = \frac{4r}{4 + r}$

16 + 4r = 20r

16r = 16

r = 1 ohm.