Magnetism and Electromagnetism The retentivity of material is useful for the construction of Permanent magnets Non-magnetic substances Transformers Electromagnets Permanent magnets Non-magnetic substances Transformers Electromagnets ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism The initial permeability of an iron rod is The lowest permeability of the iron rod The permeability at the end of the iron rod The highest permeability of the iron rod The permeability almost in non-magnetised state The lowest permeability of the iron rod The permeability at the end of the iron rod The highest permeability of the iron rod The permeability almost in non-magnetised state ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism When the current through the coil of an electromagnet reverses, the magnetic field collapses direction of the magnetic field reverses direction of the magnetic field remains unchanged magnetic field expands magnetic field collapses direction of the magnetic field reverses direction of the magnetic field remains unchanged magnetic field expands ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism For a given wirewound core, an increase in current through the coil reverses the flux lines decreases the flux density causes no change in flux density increases the flux density reverses the flux lines decreases the flux density causes no change in flux density increases the flux density ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current? 240 At 24 At 2,400 At 2.4 At 240 At 24 At 2,400 At 2.4 At ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon Resistance of the coil Number of turns of the coil Pole strength of the magnet Motion of the magnet Resistance of the coil Number of turns of the coil Pole strength of the magnet Motion of the magnet ANSWER DOWNLOAD EXAMIANS APP
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