The angle between incident ray and reflected ray is 60 degree. the value of angle of incidence and angle of reflection is 30 degree
Hi there!
a)
When the motor is first turned on, the coils are initially stationary. Thus, there is no change in magnetic flux and, consequently, no induced emf.
Therefore:

Since there's no back emf:

Solving for i using Ohm's Law:

b)
We are given that at max speed, the back EMF is 70.0 V.
Using the same equation as above:

Plugging in the values:

Solving for current:

Answer:
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