Core for a magnetising current
A Rowland ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800. What is the magnetic field B in the core for a magnetising current of 1.2 A?
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Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation :75.
Three couples and two single individuals have been invited to a party. Assume independence of arrivals to the party, and that the probability pf any particular individual or any particular couple arriving late is :4 (the two members of a couple ar
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A storage tank in a refrigeration system has a volume of 0.0060 m3 and contains a two phase liquid-vapor mixture of Refrigerant 134a at 180 kPa. Plot the total mass of refrigerant, in kg.
A long solenoid with 15 turns per cm has a small loop of area 2.0 cm2 placed inside the solenoid normal to its axis. If the current carried by the solenoid changes steadily from 2.0 A to 4.0 A in 0.1 s, what is the induced emf in the loop while the
It is claimed that a certain type of bipolar transistor has a mean value of current gain that is at least 210. A sample of these transistors is tested. If the sample mean value of current gain is 200 with a sample standard deviation of 35, would t
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