Question

In a Meter-bridge with a standard resistance of 5 Ω in the left gap, the ratio of balancing lengths on the Meter bridge wire is 2:3. The unknown resistance is

a)1 Ω

b)15 Ω

c)10 Ω

d)7.5 Ω

Correct answer is option 'D'. Can you explain this answer?

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Answer 1

Answer:

We know that in a metre bridge ,the ratio of resistance is equal to the ratio of balancing lengths .

Let unknown resistance be R :-

So, 5/R = 2/3

by solving....,

R = 15 /2

=7.5 ohm.