Magnetism and Electromagnetism A keeper is used to Provide a closed path for flux Change the direction of magnetic lines Amplify flux Restore lost flux Provide a closed path for flux Change the direction of magnetic lines Amplify flux Restore lost flux 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? Decreases Remains same Increases First increases and then decreases depending on the depth of iron in¬sertion Decreases Remains same Increases First increases and then decreases depending on the depth of iron in¬sertion ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism Core of an electromagnet should have Both low coercivity and high susceptibility None of the listed here High susceptibility Low coercivity Both low coercivity and high susceptibility None of the listed here High susceptibility Low coercivity ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism Main causes of noisy solenoid are strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force Both of the listed here uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts None of these strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force Both of the listed here uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts None of these ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism The relative permeability is less than unity is case of Diamagnetic material Ferromagnetic material Paramagnetic material Ferrits Diamagnetic material Ferromagnetic material Paramagnetic material Ferrits ANSWER DOWNLOAD EXAMIANS APP
Magnetism and Electromagnetism Substances which have permeability less than the permeability of free space are known as Bipolar Diamagnetic material Ferro magnetic material Paramagnetic material Bipolar Diamagnetic material Ferro magnetic material Paramagnetic material ANSWER DOWNLOAD EXAMIANS APP
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