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The answer is A. Hope this helps I tried my best!
Meter and second is the correct answer.
Answer:
Acceleration will be 
So option (D) will be correct answer
Explanation:
We have given angular speed of the electrical motor 
We have to change this angular speed in rad/sec for further calculation
So 
Armature radius is given r = 7.165 cm = 0.07165 m
We have to find the acceleration of edge of motor
Acceleration is given by 
So acceleration will be 
So option (D) will be correct answer
Answer:

Explanation:
Given data

To find
Magnitude of the net magnetic field B
Solution
The magnitude of the net magnetic field can be find as:
