Brain Teaser ;)

Four wires each of length 2.0 m, are bent in four loops as shown below. All of them are suspended in uniform magnetic field separately. All four carries same current, which of the following statement is correct?

Question

Brain Teaser ;)

Four wires each of length 2.0 m, are bent in four loops as shown below. All of them are suspended in uniform magnetic field separately. All four carries same current, which of the following statement is correct?

abhisar · Answer

|dw:1442123205653:dw|

abhisar · Answer

$\bf Statements$

a) Torque acting on loop P is greatest.
b) Torque acting on loop S is greatest.
c) Torque acting on all is same.
d) Torque on R is greatest.
e) Torque on Q is greatest.

anonymous · Answer

do you know how to derive torque formula?

abhisar · Answer

Yes, I do. I have posted this question just to share c:

irishboy123 · Answer

|dw:1442137721996:dw|