4. The iron door of a building is 3 m broad. It can be
opened by applying a force of 100 N normally at
the middle of the door. Calculate : (a) the torque
needed to open the door, (b) the least force and its
point of application to open the door.
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The frequency of the induced emf in rotor is? Explanation: The induced frequency will be f = P(Ns-Nr)/2. f = 4(1500-1450)/2 = 100 Hz.
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