# In the meter bridge circuit, the length AB for Null deflection in galvanometer, is 50 cm. Value of resistance r, is a. 10 Ω b. 15 Ω c. 30 Ω d. 20 Ω

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Updated on: September 13th, 2023

We know that

R1x/ (R1 + x) = R2

It is asked in the question that In the meter bridge circuit, the length AB for Null deflection in galvanometer, is 50 cm. And it is given that

R1 = 15 Ω

R2 = 10 Ω

Substituting these values

15x/ (15 + x) = 10

By further calculation

15x = 10 (15 + x)

15x = 150 + 10x

15x – 10x = 150

5x = 150

Dividing both sides by 5

x = 30 Ω

Therefore, the value of resistance r is 30 Ω.

Summary:

## In the meter bridge circuit, the length AB for Null deflection in the galvanometer is 50 cm. Value of resistance r is

In the meter bridge circuit, the length AB for Null deflection in the galvanometer is 50 cm. The value of resistance r is 30 Ω.

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