Suppose you that you are facing a straight current carring conductor and the current is flowing toward you. the line of magnetic force at any point in the magnetic field will act in

To answer this question, we will use Ampere's right hand screw rule.
This rule explains the relation between the direction of the current and the magnetic field lines in the magnetic field.

Using your right hand, the thumb will always point at the direction of the flow of current. The rest of your fingers will show the direction of magnetic field.

Applying this rule on the given question, when the current is flowing towards you, the line of magnetic force at any point in the magnetic field will act in a counter-clockwise rotation.

B) raising the temperature and reducing the volume of the gas.|-/