Why are magnets with concave shaped poles used in a D.C. motor? What happens if magnets with flat poles are used in it ?

Why are magnets with concave shaped poles used in a D.C. motor? What h

1.	Why are magnets with concave shaped poles used in a D.C. motor? What happens if magnets with flat poles are used in it ?
Answer» How do the magnetic lines of force passing through the magnetic field change as the shape of the magnet changes ? How do the magnetic lines forces pass through the magnetic field if the magnetic poles are flat ? How should the magnetic lines of force pass through a magnetic field to produced more turning effect in an armature ?

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Why are magnets with concave shaped poles used in a D.C. motor? What happens if magnets with flat poles are used in it ?

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