The core of an electric motor can be considered as a solid cylinder with rotational inertia 1-1/2-m-R², where m and R are the core's mass and radius respectively. Calculate the rotational inertia of the motor's core if R-5.7 cm and m-210 gram. The rotational inertia of the core, I- Units Select an answer What is the rotational kinetic energy of the core if it spins at 103 rpm? The kinetic energy of the core, KErot- Units Select an answer How much work is required to spin up the motor from rest to 103 rpm? The work required, W₁- Units Select an answer How much work is required to spin up the motor from 103 to 206 rpm? The work required, W₂- Units Select an answer How much power is required to spin up the motor from rest to 206 rpm in 2.6 seconds? The work required, P- Units Select an answer
Ampere Circuital Law
Ampere's Law states that "for any closed loop path, the sum of the length elements times the magnetic field in the direction of the length element is equal to the permeability times the electric current enclosed in the loop.”
Current Density
To design the electrical and electronic system, the current density is an important factor. The designer current level is the factor on which the circuit performance depends and with the help of the dimensions of the conducting current the current density is then determined. For instance, despite the lower current demanded by smaller devices as integrated circuits are reduced in size, there is a type of trend in achieving the higher device number in even smaller chip areas. The current density is increased in this region at higher frequencies because the conducting region in a wire becomes confined and this is known as the skin effect. The consequences increase as the current densities become higher.
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