Question

What are magnetic field lines? How is the direction of magnetic field at a point determined? Draw the pattern of magnetic field lines of the magnetic field produced by a current-carrying circular loop. Mark on it the direction of (i) current and (ii) magnetic field lines. Name the two factors on which the magnitude of the magnetic field due to a current-carrying coil depends.

Hint:

The right-hand thumb rule helps determine the direction of magnetic field lines around a current-carrying wire. The magnetic field lines form concentric circles around the wire, with the field direction determined by the right hand rule.

Answer 1

Magnetic field lines are visual aids representing magnetic fields. These lines indicate both the direction and strength of the field. The direction of the magnetic field at a specific location matches the force's direction on a positive magnetic pole placed there. Direction of Magnetic Field at a Point: The right-hand thumb rule determines the magnetic field's direction at a point. This rule states: - Grasp a current-carrying wire with your right hand, pointing your thumb in the current's direction; your fingers will curl in the magnetic field lines' direction. Magnetic Field due to a Current-Carrying Circular Loop: A circular loop carrying current generates a magnetic field in concentric circles around the wire. At the loop's center, the magnetic field aligns with the loop's axis. To visualize the magnetic field lines: - Magnetic field lines form concentric circles around the wire. - The right-hand thumb rule determines the direction of these field lines. At the loop's center, field lines are approximately straight and parallel to the loop's axis.