What factors contribute to the deflection of a galvanometer?

[Sukuya]

In a galvanometer the magnetic poles are cut in such a fashion which ensures radial magnetic field. If field is radial then the angle between magnetic moment i.e Area vector of the coil and field is zero. Thus the coil should not experience any torque when current is passed through the coil. Then how come there is deflection.

 

[UltrafastPED]

Does your galvanometer work like this one?

http://www.citycollegiate.com/galvanometer_XIIb.htm

 

[Sukuya]

Yes, like this one. The link says :
"In the space between it and the pole pieces, where the coil moves freely, the soft iron cylinder makes the magnetic field stronger and radial such that into whatever position the coil rotates, the magnetic field is always parallel to its plane."

My doubt is that when field is radial it should be perpendicular to the area of coil rather than parallel to its plane.

 

[UltrafastPED]

Since they do work there must be a problem in your understanding; here is another good source:
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/galvan.html