Increasing the cross-sectional area of the copper wire by a factor of two

Increasing the length of the copper wire by a factor of two

Increasing the current through the copper wire by a factor of two

Replacing the copper wire with a more conductive material

The voltage across the resistor will equal the voltage across the resistor

The current through the resistor will equal the current through the resistor

The current through the resistor will be less than the current through the resistor

The voltage across the resistor will be less than the voltage across the resistor