Suppose that you're facing a straight current-carrying conductor, and the current is flowing toward you. the lines of magnetic force at any point in the magnetic field will act in:
a. the same direction as the current.
b. a clockwise direction.
c. a counterclockwise direction.
d. the direction opposite to the current.

c

Explanation:

When the direction of current is towards the observer then the magnetic field around it will be in the form of concentric circles and its direction will be anti-clockwise when viewed from the observer side.

Whenever current is flowing in a current-carrying conductor then the magnetic field is associated with it and direction of the magnetic field is given by right-hand thumb rule according to which if thumb represents the direction of current then wrapping of fingers will give the direction of the magnetic field                

1 the 4 is sig

do you have a formula possibly