Unlike electric field lines, magnetic field lines are continuous and always form closed loops.
a. true
b. false

True

Explanation:

Magnetic field refers  to a region around a magnetic material or magnet, where a magnetic effect i felt. The magnetic lines of force are continuous lines that always travels from north to south pole and forms a closed loop. It is for these reason that magnetic poles exists as dipoles and not mono-poles. Electric field lines however travel from positive to negative and cannot return to the positive hence they do not form closed  loops, They can only travel in just one direction.

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