%20%20ELECTROMAGNETIC%20INDUCTION%20AND%20ALTERNATING%20CURRENTS - Topic Wise Multiple Choice Questions (MCQ)
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1 )
A coil having area 2m2 is placed in a magnetic field which changes from 1 wb/m2 to 4 wb/m2 in an interval of 2 second. The emf induced in the coil of single turn is....
2 )
Two different loops are concentric & lie in the same plane. The current in outer loop is clockwise & increasing with time. The induced current in the inner loop then, is …….
3 )
A ring of radius r is rotating about its diameter with angular velocity ω in a perpendicular magnetic field B➙ It has 20 turns. The emf induced is
4 )
A magnetic field 2 × 10–2T acts at right angles to a coil of area 200 cm2 with 25 turns. The average emf induced in the coil is 0.1 v when it removes from the field in time t. The value of t is
5 )
The magnetic flux linked with a coil, in webers, is given by the equation ɸ = 4t2 – t + 7. Then the magnitude of induced emf at 2 sec will be ...