Define magnetic lines of force. Also draw and show magnetic lines of force of a bar type magnet.
Magnetic Lines of force- These are the imaginary lines (having no physical existence) introduced by Faraday for the pictorial representation of the distribution of a magnetic field.
OR
A line of force is defined as a line along which an isolated N-pole would travel if free to move in a magnetic field and it is such that the tangent at any point gives direction of the resultant force at that point.