Question

Why the meter bridge wire is uniform?

Answer 1

Answer:

Owing to this the reading of the meter bridge experiment to determine the unknown resistance will have error, hence the wire used must have a uniform cross sectional area throughout its length.

Answer 2

TO keep the experiment free from the error the wire should have uniform resistance throughout its length.

Explanation:

• Meter bridge wire must be uniform throughout  because we need to find the value of resistance of the given wire and we use the Ohms law to find the relation by plotting the graph.

According to ohms law:

$V=R.I$

• Statement: The current in a conductor between two points is directly proportional to the potential difference between the two points.

Also we have the relation between the dimensions of the wire and resistance as:

$R=\rho. \frac{l}{a}$

where:

$\rho=$ specific resistance of the material

$l=$ length of the wire

$a=$ area of the wire

So, from the above relation we can conclude that the wire of the meter bridge must be uniform in its dimension and electrical property.

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TOPIC: meter bridge

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