GEOLOGY

Detailed explanation-1: -The magnetic field is represented by the arrows shown in the diagram, where each arrow shows the strength (according to the arrow’s length) and direction of the magnetic field at the point from which the arrow emerges.

Detailed explanation-2: -The arrows represent invisible lines of force, known as magnetic field lines. They indicate the direction a compass arrow lies – pointing north–south.

Detailed explanation-3: -The direction of the magnetic field lines at a place can be determined by using a compass needle. The north end of the needle of the compass indicates the direction of the magnetic field at the point where is placed.

Detailed explanation-4: -Arrows E shows, the direction of magnetic field lines due to current carrying wire of circuit X which is given by right hand thumb rule.