Magnetism and Electromagnetism The retentivity of material is useful for the construction of Permanent magnets Transformers Non-magnetic substances Electromagnets Permanent magnets Transformers Non-magnetic substances Electromagnets ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it? 18.75 At 30 At 187 At 300 At 18.75 At 30 At 187 At 300 At ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism The ability of a material to remain magnetized after removal of the magnetizing force is known as reluctance retentivity hysteresis permeability reluctance retentivity hysteresis permeability ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will Be excessive Increase Remain Constant Decrease Be excessive Increase Remain Constant Decrease ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength? 250 AT/m 0.25 AT/m 25 AT/m 2500 AT/m 250 AT/m 0.25 AT/m 25 AT/m 2500 AT/m ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism Which of the following is expected to have the maximum permeability ? Brass Copper Zinc Ebolite Brass Copper Zinc Ebolite ANSWER DOWNLOAD EXAMIANS APP
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