Electromagnetic induction Lenz's law is a consequence of the law of conservation of Energy Induced e.m.f. Induced current Charge Energy Induced e.m.f. Induced current Charge 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 24 mH 12 mH 48 mH 3 mH 24 mH 12 mH 48 mH 3 mH ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic induction Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is 5 H 15 H 10 H 20 H 5 H 15 H 10 H 20 H ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic induction A laminated iron core has reduced eddy-current losses because The laminations are stacked vertically More wire can be used with less D.C. resistance in coil The laminations are insulated from each other The magnetic flux is concentrated in the air gap of the core The laminations are stacked vertically More wire can be used with less D.C. resistance in coil The laminations are insulated from each other The magnetic flux is concentrated in the air gap of the core ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic induction A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by The resistance of magnetic path Change of number of turns of coil Variation in voltage to the coil Variation in coil current The resistance of magnetic path Change of number of turns of coil Variation in voltage to the coil Variation in coil current ANSWER DOWNLOAD EXAMIANS APP
Electromagnetic induction The inductance of a coil will increase under all the following conditions except When more length for the same number of turns is provided When the number of turns of the coil increase When permeability of the core increases When more area for each turn is provided When more length for the same number of turns is provided When the number of turns of the coil increase When permeability of the core increases When more area for each turn is provided ANSWER DOWNLOAD EXAMIANS APP
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