Complete the table properly

Given below are the diagrams showing the connection of ammeter and voltmeter in a circuit. Of these, which are correct?

The resistance of a 10 cm long wire is 12 Ω. If this is folded into two parts of equal length and included in a circuit, how much will be the resistance produced?

Of the following, which one correctly indicates Ohm’s Law?

A potential difference of 6 V is applied across a conductor having 12 Ω resistance. How much current will pass through it?

How many times will the current increase if length of the resistor is halved and potential difference is doubled?