Answer:

The resistivity of a conductor is defined as the property of the conductor that prevents the flow of electric current. The resistance of a particular material is one-of-a-kind. Resistance is proportional to the length of the conductor and inversely proportional to the amount of current flowing through it.

When the length is doubled, the resistance increases by a factor of two and the current flow decreases by a factor of two. The cause of the decrease in ammeter reading is as follows