Which of the following is true about a compass kept near a current carrying conductor?

Reversing the direction of current reverses the deflection of the needle. Iron fillings sprinkled around the current carrying wire arrange themselves in concentric squares with the wire at the center. Both 1 and 2 None of the above.

Reversing the direction of current reverses the deflection of the needle.

Iron fillings sprinkled around the current carrying wire arrange themselves in concentric circles with the wire at the center.