Q.1.  plz... explain  example 5.10  on page 191 ncert.....

Q.2.  plz.. explain  example 5.7 , part (d)  , page 184.  ncert...

EXAMPLE 5.10 IS JUST FORMULA BASE........

EXAMPLE 5.7 ::::::::

ya it is true that "AN ELEMENT CAN NEVER EXERT FORCE/TORQUE ON ITSELF DUE TO ITS OWN MAGNETIC FIELD"

BUT CAN XPERIENCE DUE TO ANOTHER^,S FIELD........

 do reply if got it right