Question

A solenoid has 1000 turns per metre, carries a current of 2 A, and has a core with relative permeability 400. What is its approximate magnetic induction?

पर्याय

• \[1.0\,\mathrm{T}\]

• \[2\times10^3\,\mathrm{T}\]

• \[0.001\,\mathrm{T}\]

• \[400\,\mathrm{T}\]

Answer 1

First, \[H=nI=2\times10^3\,\mathrm{A/m}\]. Using \[B=\mu_r\mu_0H\] with \[\mu_r=400\] gives approximately \[1.0\,\mathrm{T}\].