Electronic Principles Which one of the following principles best describes the basic operation of an electromagnet? Current is induced in a conductor that is moving through a magnetic field Like magnetic poles repel, while unlike poles attract None of these Current flowing through a conductor generates a magnetic field Like magnetic poles attract, while unlike poles repel Current is induced in a conductor that is moving through a magnetic field Like magnetic poles repel, while unlike poles attract None of these Current flowing through a conductor generates a magnetic field Like magnetic poles attract, while unlike poles repel ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Suppose the peak value of a sinusoidal voltage is 50 V. What is the rms value? 35.4 V 37.4 V 38.74 V 30.4 V None of these 35.4 V 37.4 V 38.74 V 30.4 V None of these ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles An intrinsic semiconductor has some holes in it at room temperature. What causes these holes? Free electrons Valence electrons Thermal energy None of these Doping Free electrons Valence electrons Thermal energy None of these Doping ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles A power transformer steps 100 V down to 10 V. If the current in its primary winding is 2 A, what is the current in the secondary winding? None of these 20 A 50 A 0.20833333333333 None of these 20 A 50 A 0.20833333333333 ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles An ideal voltage source has None of these A load-dependent current A load dependent voltage Infinite internal resistance Zero internal resistance None of these A load-dependent current A load dependent voltage Infinite internal resistance Zero internal resistance ANSWER DOWNLOAD EXAMIANS APP
Electronic Principles Which one of the following phrases best describes residual magnetism? Magnetism that remains in the core of an electromagnet after the current through the coil is turned off None of these The circular magnetic field that surrounds a conductor carrying a current The amount of magnetic flux that is not confined to the core material of an electromagnet The force of attraction between the poles of a permanent and temporary magnetic field Magnetism that remains in the core of an electromagnet after the current through the coil is turned off None of these The circular magnetic field that surrounds a conductor carrying a current The amount of magnetic flux that is not confined to the core material of an electromagnet The force of attraction between the poles of a permanent and temporary magnetic field ANSWER DOWNLOAD EXAMIANS APP
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