Question

what happens to the resistivity of a conductor if its length is doubled and area of cross section is halved​

Answer 1

Answer:

Resistivity increases

Explanation:

Answer 2

Answer:

the resistance of a conductor is directly proportional to its length. so if length is increased then resistivity increases ande vice versa. so if length is doubled resistance will also get doubled i.e resistance is 4 times that of original resistance.

now, the resistance of a conductor is inversely proportional the area  of cross section. The larger the cross sectional area, the lower the resistance since the electrons have a larger area to flow through.

So your Resistance will become doubled.