The magnetic field (B) inside a long solenoid having 'n', turns per unit length and carrying current 'I' when iron core is kept in it is $\left(\mu_{0}=\right.$ permeability of vacuum, $\chi=$ magnetic susceptibility)A) $\mu_{0} \mathrm{nI}(1-\chi)$B) $\mu_{0} \mathrm{nI} \chi$C) $\mu_{0} \mathrm{nI}^{2}(1+\chi)$D) $\mu_{0} \mathrm{nI}(1+\chi)$

Home » The magnetic field (B) inside a long solenoid having ‘n’, turns per unit length and carrying current ‘I’ when iron core is kept in it is permeability of vacuum, magnetic susceptibility)A) B) C) D)

The magnetic field (B) inside a long solenoid having ‘n’, turns per unit length and carrying current ‘I’ when iron core is kept in it is $\left(\mu_{0}=\right.$ permeability of vacuum, $\chi=$ magnetic susceptibility)
A) $\mu_{0} \mathrm{nI}(1-\chi)$
B) $\mu_{0} \mathrm{nI} \chi$
C) $\mu_{0} \mathrm{nI}^{2}(1+\chi)$
D) $\mu_{0} \mathrm{nI}(1+\chi)$

Physics

The magnetic field (B) inside a long solenoid having ‘n’, turns per unit length and carrying current ‘I’ when iron core is kept in it is $\left(\mu_{0}=\right.$ permeability of vacuum, $\chi=$ magnetic susceptibility)
A) $\mu_{0} \mathrm{nI}(1-\chi)$
B) $\mu_{0} \mathrm{nI} \chi$
C) $\mu_{0} \mathrm{nI}^{2}(1+\chi)$
D) $\mu_{0} \mathrm{nI}(1+\chi)$

Answer is (D)
$\mathrm{B}=\mu_{0} \mathrm{ni}(1+\chi)$

i

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