Magnetism and Electromagnetism A permanent magnet Attracts some substances and repels others Attracts only ferromagnetic substances Attracts all paramagnetic substances and repels others Attracts ferromagnetic substances and repels all others Attracts some substances and repels others Attracts only ferromagnetic substances Attracts all paramagnetic substances and repels others Attracts ferromagnetic substances and repels all others ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism The change of cross-sectional area of conductor in magnetic field will affect reluctance of conductor resistance of conductor None of these both of the listed here reluctance of conductor resistance of conductor None of these both of the listed here ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism A material which is slightly repelled by a magnetic field is known as conducting material diamagnetic material paramagnetic material ferromagnetic material conducting material diamagnetic material paramagnetic material ferromagnetic material ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism When the current through the coil of an electromagnet reverses, the direction of the magnetic field reverses magnetic field collapses magnetic field expands direction of the magnetic field remains unchanged direction of the magnetic field reverses magnetic field collapses magnetic field expands direction of the magnetic field remains unchanged ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be 24 N 2.4 N 0.24 N 240 N 24 N 2.4 N 0.24 N 240 N ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current? 24 At 240 At 2.4 At 2,400 At 24 At 240 At 2.4 At 2,400 At ANSWER DOWNLOAD EXAMIANS APP
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