Immagini

DESCRIPTION

Exhibit 245 is a solenoid of 54 turns of probably copper wire, soldered with clips at the end for external connection and certainly used for the study and applications of electromagnetism. At one end the wire is wrapped around a bakelite cylinder. When a current I passes in the wire, there is a magnetic field B both on the inside and on the outside of the solenoid proportional to the number of turns N, to the current I and inversely proportional to the number of turns N. If the solenoid is placed in a material of permeability μ, the modulus of the magnetic induction B is given by the equation: EQ01: [ \rm B = \mu\frac{N\cdot I}{L} ]. For a solenoid which is very long in comparison with its diameter, the magnetic field created in the inside is parallel to its axis and the direction is that of a right-handed screw. The magnetic flux in the solenoid is given by: EQ02: [ \rm \varphi = N \cdot B \cdot S ]. where S is the cross section of the solenoid. See also exhibit 283 (Mobile solenoid) and exhibit 501 (28 turn solenoid)

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