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→Physics of Magnetorquers
[[File:Equation5.png|frame|center]]
Magnetic torquer is a current carrying insulated loop which can be mounted on satellite body. The outer space has magnetic field due to the earth. In presence of this field, torquer can exert torque on the satellite when current is passed through it. Since magnetic field doesn’t vary over the length scale of dimension of torquer, it can be assumed to be uniform and above formula is applicable.
[[File:Torquer1.jpg|frame|center| Magnetorquer used in Pratham]]
== Modeling of Torquer ==
== 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>