Two wires of equal length are bent in the from of two loops. One of the loops is a square wheres the other loop is circular. These are suspended in a uniform magnetic field and the same current is passed through them. Which loop will experience greater torque ?

Explanation

Torque on a current carrying loop is given by,
`vec tau= IvecA xx vecB`
Where `vecA` is the area of the loop, `vecB` is the magnetic field and I is the current. According to the question. I and `vecB` are same for both the loops.
Now, for loops having same perimeter, circular loop has greater area than the square loop. So, that circular loop will experiences greater torque.