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== Effect of the ferromagnetic core ==
[[File:TorqueRodTorqueRod2.pnggif|frame|thumb|Torque RodA representative image for torque rod. Image reproduced from [https://wwwcommons.cubesatshopwikimedia.comorg/product/nss-magnetorquer-rodwiki/ File:Simple_electromagnet2.gif here]]]
The magnetorquers in shape of coil take too much space and have larger mass. In order to generate larger moment with stringent mass and size constraints, ferromagnetic core torquers can be used. <br \>
These are called torque rods. It is a solenoid of length ‘l’ and radius ‘r’ with ferromagnetic core of relative permeability ‘µ_r’. The magnetic moment for cored solenoid in steady state is given by: <ref>http://www.aerospades.com/uploads/3/7/3/2/37325123/cadre_torquers.pdf </ref>