Question

Which of the following statement about magnetic field lines is true?

Options

• The larger the number of field lines crossing per unit area, the weaker is the magnitude of the magnetic field B

• The perpendicular to the field line at a given point gives direction of magnetic field

• The smaller the number of field lines crossing per unit area, the stronger is the magnitude of the magnetic field B

• The magnetic field lines of a magnet (or a solenoid) form continuous closed loops

Answer 1

The magnetic field lines of a magnet (or a solenoid) form continuous closed loops.

Explanation:

The solenoid field lines go from North to South pole on the outside, but from South to North pole on the inside.