ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS - Topic Wise Multiple Choice Questions (MCQ)
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....
4 v
3 v ✔
2 v
1.5 v
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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 …….
clockwise
counter clockwise ✔
direction depends on the ratio of loop radii
zero
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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
20Bπr^2 sin wt
20Bπr^2 cos wt
10√2Bπr^2
20Bπr^2 w sin wt ✔
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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
0.1 sec ✔
1 sec
0.01 sec
1.5 sec
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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 ...
17 v
21 v
15 v ✔
13 v
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