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Magnetic Field of a Solenoid

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2022 1 question

A long solenoid of radius 1 mm has 100 turns per mm. If 1 A current flows in the solenoid, the magnetic field strength at the centre of the solenoid is :

2020 1 question

A long solenoid of 50 cm length having 100 turns carries a current of 2.5 A. The magnetic field at the centre of the solenoid is: ($\mu_0=4\pi\times10^{-7}\ T\,m\,A^{-1}$)