Question

A 6 ohm resistance is connected in the left gap of a meter bridge. in the secong gap 3 ohm and 6 ohm are joined in parllel. the balance point of the bridge is at ________ ?

Answer 1

1/3 + 1/6 = 1/2    => 2 ohms on the second gap
   
   hence  the balance point of the bridge is at 6 / (6+2) = 6/8 = 3/4

   the balance point will be at  75 cm mark of the meter.

Answer 2

Answer:

A 6 ohm resistance is connected in the left gap of a meter bridge. in the second gap 3 ohm and 6 ohm are joined in parallel. the balance point of the bridge is at 25 cm.

Explanation:

This is a meter bridge, so:

$l_{1} + l_{2}$= 1 m

Now balancing the meter bridge;

$\frac{l1}{l2} = \frac{6}{\frac{6*3}{6+3} }$

$\frac{l1}{l2}= \frac{6}{2}$

$\frac{l1}{1- l1}= 3$

$l_{1}$= 0.25 m

Thus, the balance point is at 25 cm.

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