Comment on the statement "Magnetic lines of force always form close loops".

List the properties of magnetic lines of force.

The question given below consist of an assertion (A) and a reason ( R). Use the following key to choose the appropriate answer to these questions from the codes (a), (b), ( c) and (d) given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false and R is also false. Assertion: Magnetic lines always from closed loops. Reason: Magnetic poles always exist in pairs.

The magnetic lines of force inside a bar magnet