Correct Answer - Option 4 : 22.5°

__Concept:__

Step angle of the variable reluctance stepper motor is given by

\(β = {{(N_s -N_r)× 360°} \over (N_s× N_r)}\)

Where Ns = Number of stator teeth

Nr = Number of rotor teeth

__Calculation:__

Given that, Nr = 8

Ns = 16

∴ The stepping angle can be calculated as

\(β = {{(16 -8)× 360°} \over (16× 8)}\)

β = 22.5°