Question

4. To find the resistance of a gold bangle, two diametrically opposite points of the bangle are connected to thetwo terminals of the left gap of a metre bridge. A resistance of 4 is introduced in the right gap. What is theresistance of the bangle if the null point is at 20 cm from the left end?(a) 2(b) 4 (c) 8(d) 16​

Answer 1

Answer:

Resistance of the bangle is 2 ohm

Explanation:

As we know that for the condition of null point we must have

$\frac{R_1}{R_2} = \frac{L}{100 - L}$

here we know that

$R_2 = 4 ohm$

$L = 20 cm$

so we have

$\frac{R_1}{4} = \frac{20}{80}$

$R_1 = 1 ohm$

now we know that bangle is connected at diametrical ends so we have

$\frac{R}{2} = R_1$

$R = 2 ohm$

#Learn

Topic : Meter Bridge

https://brainly.in/question/15029368

Answer 2

Correct answer is 4Ω.