Question

A straight wire of length l and electric dipole moment p is bent to form a semicircle. The new dipole moment would be

Answer 1

The new dipole moment will be ML/π.

Explanation:

A wire of length l is bent to make a semiconductor of radius r. So, we can say that  

length of wire = circumference of semicircle  

l = πr  

and,

r = l/2π  

we know that,

magnetic dipole = magnetic dipole moment × minimum separation between two dipoles  

minimum separation between dipoles is = 2r

                                                                      =2l/2π  

                                                                      = l/π  

magnetic dipole = M × l/π = Ml/π