i have hard time in getting answers for these questions;can you please answer them

1. Emf and torque produced in a DC machine are proportional to ________ and _________ respectively.

2.in a 4-pole DC machine having flux/pole equal to 0.1 wb rotating at 1500 rpm and No. of coil sides = 100 what is the average coil emf generated

3.Average coil emf for 20 coil turns (E1) and 40 coil turns (E2), will have ratio E1/E2=____ (assuming all other parameters same for both machines).

4. non-zero armature current (E2) can be related asEmf produced by DC machine, for zero armature current (E1);how is this possible

5.In the SI unit analysis, What is the value of pole pitch whose mean air gap radius= 0.5mm and P=4?

6. .What is the torque equation in terms of B, Ic, l, Zr (r= mean air gap radius)?

7.for 10 armature conductors with 2 parallel paths,What is the value of Np in an average coil emf equation

8.justify that; average energy stored in the magnetic field remains constant independent of the armature rotation in a DC machine

9. Nature of the flux density wave in the air gap is__________ (for armature current equal to 0)

10.explain on same direction of conductor emf as expressed by mode machine operating technique