Question

can someone give,
contents of meter bridge project class 12 ? ​

Answer 1

$\sf{\huge{\underline{\red{Meter\:Bridge :-}}}}$

$\sf{\large{\underline{\pink{Meaning :-}}}}$

It is simply a practical application of the wheatstone bridge that is used to measure unknown resistances .

$\mathtt{\bf{\large{\purple{\underline{Principle :-}}}}}$

Its working is based on the principle of wheatstone bridge.

When bridge is balanced ,

$\dfrac{P}{Q} = \dfrac{R}{D}$

$\mathtt{\bf{\large{\orange{\underline{Construction :-}}}}}$

It consists of usually 1 metre long magnet and wire of uniform cross section, stretched along a metre scale fixed over a wooden board to and soldered to L-shaped copper strip so to provide gap ab and a1b1 given in the resistance ab connected in gap a1b1 .

A source of EMF is connected across AC & a movable Jockey and a galvanometer across BD.

$\mathtt{\bf{\large{\blue{\underline{Working :-}}}}}$

After taking a jockey move along AC .There is no defection in Galvanometer. This is balance condition of wheatstone bridge. If p and q are part of AB and BC of wire and balanced condition .

$\dfrac{P}{Q} = \dfrac{R}{D}$

• AC = 100 cm
• AB = L cm
• BC = ( 100 - l )

$\dfrac{P}{Q} = \dfrac{Resistance\: of \:AB}{Resistance \:Of \:BC}$

➝ $\dfrac{l}{100-l}$

Hence,

➝ $\dfrac{R}{S} = \dfrac{l}{(100-l)}$

➝ $\boxed{\red S = {\dfrac{R(100-l)}{l}}}$

_______________________________

Fig. Meter Bridge attached ✔