Question

a meter bridge experiment the ratio of left gap resistance to right gap resistance is 1:3. The balance point from left is:
(a) 20cm (b) 25cm

(b) 30cm (d) 35cm

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Answer 1

Given:

A meter bridge experiment the ratio of left gap resistance to right gap resistance is 1:3.

To find:

Balance point from left?

Calculation:

• Let balance point from left be 'L'. So, the balance point from right will be (100 - L).

Now, we know that the metre bridge works on the principle of BALANCED WHEATSTONE BRIDGE.

• Let the resistances be x and 3x.

$\therefore \: \dfrac{x}{3x} = \dfrac{L}{100 - L}$

$\implies \: \dfrac{1}{3} = \dfrac{L}{100 - L}$

$\implies \: 100 - L = 3L$

$\implies \: 4L = 100$

$\implies \: L = 25 \: cm$

So, balance point from left is 25 cm.