Question

In a metre bridge, two unknown resistances R and X, when connected the two gaps,give a null point is 40cm from one end.what is the ratio of R and X?

Answer 1

Here L = 40 cm.

Using Metre Bridge Formulla:  

$\frac{P}{Q}$ = $\frac{R}{X}$  

OR

$\frac{L}{100-L}$ = $\frac{R}{X}$  

Therefore:

$\frac{R}{X}$ = $\frac{40}{60}$  

= $\frac{2}{3}$  

#Be Brainly.  

@karangrover12.

Answer 2

Hey !

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Here,

l = 40 cm.

Using Metre Bridge Formulae,

★ P/Q = R/X

Or

★ X/Y = l/100 - l

So,

X/Y = 40 / 100 - 40

= 40 / 60

= 2/3

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Thanks !