Explanation:
The magnetic field around a wire is given by :
.......(1)
Where
I is current
r is the distance from wire
The magnetic field around the solenoid is given by :
.....(2)
Where
N is the no. of turns per unit length
From equation (1) and (2), it is clear that the strength of the magnetic field in both current-carrying wire and the solenoid is directly proportional to the current. So, as current intensity increases, the strength of the magnetic field around both a current-carrying wire and solenoid increases. The given statement is false.
Iron
Iron is a chemical element with symbol Fe (from Latin: ferrum) and atomic number 26. It is a metal in the first transition series.
( Source : Wikipedia )
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Concave makes things smaller and convex makes things bigger