1.

A piece of copper is to be shaped into a conducting wire of maximum resistance. The suitable length and diameter are …………and …………respectively.

Answer»

L and d
2L and d
L/2 and 2D
2L and d/2

Solution :We know that,
`R=(rho1)/(A)=(rho1)/(pi r^(2))=(rho1)/(pi r^(2))`
If the length of wire is increases, then the radius of wire is decreases.
To get the maximum resistance the SUITABLE and diameter are 2L and d/2.


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