Magnetism and Electromagnetism Temporary magnets are used in Motors All of the listed here Generators Loud speakers Motors All of the listed here Generators Loud speakers ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism A certain amount of current flows through a ring shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil? Remains same Increases Decreases First increases and then decreases depending on the depth of iron in¬sertion Remains same Increases Decreases First increases and then decreases depending on the depth of iron in¬sertion 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 Increase Be excessive Remain Constant Decrease Increase Be excessive Remain Constant Decrease ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is 2,000 V 31.25 V 1,000 V 3,125 V 2,000 V 31.25 V 1,000 V 3,125 V ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 Wb? 90,000 At/Wb 14,400 At/Wb 1,440 At/Wb 9,000 At/Wb 90,000 At/Wb 14,400 At/Wb 1,440 At/Wb 9,000 At/Wb ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism Which of the following is a ferromagnetic material? Aluminium Tungsten Copper Nickel Aluminium Tungsten Copper Nickel ANSWER DOWNLOAD EXAMIANS APP
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