(Solved): Question 5 (20 marks) (a) Write down the equation that represent the force, F_(c), exerted (2 marks ...
Question 5 (20 marks) (a) Write down the equation that represent the force,
F_(c), exerted (2 marks) on a charge,
q, that is located in the point of space where an electric field,
E, exists. (b) Write down the equation that represent the magnetic force, (2 marks)
F_(m), acting on a charge,
q, that is moving in a velocity,
v, through a magnetic field,
B, where
\theta is the angle between
vand
B. (c) A 500-turn coil is placed in a magnetic field that varies (4 marks) uniformly from 100 mWbb to 20 mWbb in 5 seconds. Calculate the induced emf in the coil. (d) A four-pole synchronous AC generator with a smooth air gap (4 marks) has a distributed rotor winding with 260 series turns, a winding factor of 0.935 , and an air gap of length 0.7 mm . Assuming the mmf drop in the electrical steel to be negligible, find the rotor- winding current required to produce a peak, space- fundamental magnetic flux density of 1.8 T in the machine air gap. (e) List down the differences between concentrated winding and (8 marks) distributed winding.
