A circular loop carrting a current a current I has wire of total length L. A uniform umagnetic field B exists parallel to the plane of the loop. (a ) find the trouque on the loop.(b) If the sme length of the wire is used to form a squar loop, what would be the torque? Which is larger?

Answer

A, B, D

Explanation

`L=2pir , L=6a rArr a=L//6`
`tau=Bipir^(2) , tau=2Bia^(2)`
`=(iL^(2)B)/(4pi)` As `i_("loop" )gtl_("square loop")=2 BiL^(2)/36=(BiL^(2))/18`