Electromagnetic induction A laminated iron core has reduced eddy-current losses because More wire can be used with less D.C. resistance in coil The magnetic flux is concentrated in the air gap of the core The laminations are insulated from each other The laminations are stacked vertically More wire can be used with less D.C. resistance in coil The magnetic flux is concentrated in the air gap of the core The laminations are insulated from each other The laminations are stacked vertically ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic induction Lenz's law is a consequence of the law of conservation of Induced current Charge Induced e.m.f. Energy Induced current Charge Induced e.m.f. Energy ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic induction The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be 12 mH 48 mH 3 mH 24 mH 12 mH 48 mH 3 mH 24 mH ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic induction Air-core coils are practically free from Both Hysteresis losses & Eddy current losses Eddy current losses None of the listed here Hysteresis losses Both Hysteresis losses & Eddy current losses Eddy current losses None of the listed here Hysteresis losses ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic induction An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is 2 wb 0.02 wb 0.2 wb 20 wb 2 wb 0.02 wb 0.2 wb 20 wb ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic induction Reversing the field or the current will reverse the force on the conductor. No Yes No Yes ANSWER DOWNLOAD EXAMIANS APP