Magnetic field of a solenoid
Magnetic field of a solenoid
Physics INK
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Find the magnetic field at point P on the axis of a tightly wound solenoid (helical coil) consisting of n turns per unit length wrapped around a cylindrical tube of radius a and carrying current I. Express your answer in terms of 8 and 8. Consider the turns to be essentially circular, and use the result. What is the field on the axis of an infinite solenoid (infinite in both directions)?
A solenoid is an infinite number of circular loops carrying current
The magnetic field due to the circular loop is
Let us express
or,
or,
and
or
The magnetic field due to the circular loop becomes,
or,
The magnetic field due to the solenoid is
or,
We have
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#Electrodynamics
#Physics
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