IIT JEE , AIEEE Forum - Physics , Electricity

vipul_jsh

Q. 1 Two wires of equal length r bent in the form of 2 loops. One loop is squared shape & other is circular. They r suspended in uniform magnetic field & same current is passed rthrough them. Which loop will experience greater torque & why ?

vineet

rajatkashyap

TORQUE WILL BE MORE ON CIRCULAR LOOP

when we make a square of a wire of length r;

its area is A'=(r/4)^2=r^2/16

and for a circle;

let l be the radius;

2*pi*l=r;

l=r/2*pi

area A''=pi*(r/2*pi)^2

=r^2/4*pi

now,torque=BINA

as A''>A'

therefore torque on circular coil will be more than square loop

BYE!!!!!!!!!!

vineet

T=MBsin(

)

For,square------T=uir^2 Bsin

/16

For,cirle-----------T=ui^2 Bsin

/4

Clearly of 2, T of circle is greater

krishna.gopal

For same field torque will be higher in loop with higher magnetic moment. And for same current magnetic moment is higher in loop with highest area.

For same perimeter, the area is highest for circle, so circle will experience more torque then any other figure (Be it triangle, squrare, rectangle, hexagon or any random figure.

shipra22_bhardwaj

hey

its clear tat t of circle will b more

& i agree with vineet

bye!!!!!

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