In a meter bridge, null point is at , when the resistance … | CGP Edu

Physics Experimental Skills Resistivity of the Material of a Given Wire Using Metre Bridge MCQ (Single Correct)

In a meter bridge, null point is at , when the resistance S is shunted by resistance the null point is found to be shifted by a distance of 18.2 cm. The value of unknown resistance R should be

A

B

C

D

None of these

Text Solution

Verified by Experts

The correct answer is:

Step 1: Recall the meter bridge formula
For a meter bridge, the balance condition is:

Step 2: Define the problem

Initial balance without shunt:

After shunting by , the effective resistance becomes:

And the new null point is shifted by , so:

Step 3: Apply balance condition after shunt

Step 4: Express in terms of

Also, from initial balance:

Step 5: Substitute into shunt equation

Step 6: Find

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