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A solenoid with 500 turns is 0. 10 m long and carries a current of 4. 0. The strength of magnetic field at its center will be 2.5 * [tex]10^{-2}[/tex] H
Magnetic Field is the region around a magnetic material or a moving electric charge within which the force of magnetism acts.
A coil of wire which is designed to generate a strong magnetic field within the coil is called a solenoid. Wrapping the same wire many times around a cylinder creates a strong magnetic field when an electric current is passed through it. N denotes the number of turns the solenoid has.
Magnetic field at the center of the solenoid = mu0 * I * N / L
I = current in the solenoid
N = number of turns in the solenoid
L = length of the coil
B = 4π * [tex]10^{-7}[/tex] * 4 * 500 / 0.10
= 251200 * [tex]10^{-7}[/tex] H
= 2.5 * [tex]10^{-2}[/tex] H
To learn more about solenoids here
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