CE A cylindrical wire is to be doubled in length, but it

Solution 89GP

Step 1 of 2

Here we need to find whether the radius of the cylindrical wire should be increased or decreased when its length is doubled by keeping resistance constant.

• The resistance of the wire in the initial case is given by,

Where  and  are the length and area of the wire, is resistivity of wire.

• The resistance of the wire in the final case when the length is doubled is given by,

Where  and  are the length and area of the wire, is resistivity of wire.