Question

suppose that youre 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 direction
opposite to the
current.
b) a clockwise

Explanation:

To solve this, we use the right - hand rule for a current - carrying conductor.

Step 1: Recall the right - hand rule

For a straight current - carrying conductor, if we hold the conductor in our right hand such that the thumb points in the direction of the current, then the fingers curl in the direction of the magnetic field lines.

Step 2: Apply the rule to the given situation

The current is flowing toward us. So, when we hold the conductor with our right hand and the thumb points towards us (in the direction of the current), the fingers of our right hand will curl in a clockwise direction. This means that the lines of magnetic force (magnetic field lines) will act in a clockwise direction around the conductor.

Now, let's analyze the options:

• Option A: The direction opposite to the current is not the direction of the magnetic field lines. The magnetic field lines are circular around the conductor, not along the line opposite to the current direction.
• Option B: As we found using the right - hand rule, when the current is towards us, the magnetic field lines are clockwise.

We use the right - hand rule for a current - carrying conductor. When the current flows toward us, holding the conductor with the right hand (thumb in current direction) shows the magnetic field lines curl clockwise. Option A is incorrect as magnetic field lines are not opposite to current direction.

Answer:

B) a clockwise direction (assuming the full option B is "a clockwise direction around the conductor")