Magnetic field due to toroid



 A toroid is a long solenoid which is bend into circular form. So, toroid is equivalent to the solenoid having infinite length but it has finite no. of circular turns. Consider a toroid having radius r, carrying current I through it. If N is the number of turns in toroid and n be the no. of turns per unit length then

Magnetic field due to toroid

again magnetic field due to infinite solenoid is

Magnetic field due to toroid

 then the magnetic field due to toroid is

Magnetic field due to toroid

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