Which one of the following statement is not correct ........

Geography Earth Geology

Which one of the following statement is not correct?

The earth's magnetic field is due to the motion of metals like iron and nickel in the core of the earth

The magnetic field lines of force are widely separated near the poles of a magnet but these lines come closer to one another at other places

If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density decreases

When the speed of a conductor moving through a magnetic field is increased, the induced voltage increases

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Explanation:

2nd option is incorrect i.e. The magnetic field lines of force are widely separated near the poles of a magnet but these lines come closer to one another at other places
Curved lines used to represent a magnetic field, drawn such that the number of lines relates to the magnetic field's strength at a given point and the tangent of any curve at a particular point is along the direction of magnetic force at that point.