Size of a high speed motor as compared to low speed motor for the same H.P. will be
A. Bigger
B. Smaller
C. Same
D. Any of the above
Answer: Option B
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H.P= speed x torque
Since, Hp is same so torque will be less for small motor. So, less amount of mass will be required to deliver the same torque. Moreover, bigger magnet + thick wire + higher current = more torque.
Torque= force × radius
Less torque means less diameter
I hope now it's clear to all.