Magnetism

Q18 ans c

@nishantthakre U is not minimum as the angle b/w dot product is 90,not 180.
Torque is not zero,angle b/w cross product is 90 degrees.
Evidently,you can see that dipole has net force zero.

@arunsettykodavali
How it has zero force

@nishantthakre the dot product of dipole.moment and magnetic field is zero.

@arunsettykodavali said in Magnetism:
@nishantthakre the dot product of dipole.moment and magnetic field is zero.
Force doesn't come from dot product of moment and field

@nishantthakre no,force is the divergence of that quantity.
As the quantity itself is zero,it's divergence will obviously be zero.
Btw, divergence is essentially a derivative in your level.
You will learn more about divergence in your higher standard.