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CBSE
Class 12 Physics
Electromagnetic Induction
Quiz 2
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When the magnetic field is parallel to a surface, then the magnetic flux through the surface is:
0%
infinite
0%
zero
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small but not zero
0%
large but not infinite.
Explanation
zero
The energy stored in a 50 mH inductor carrying a current of 4 A is:
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0.1 J
0%
0.4 J
0%
0.04 J
0%
0.01 J
Explanation
0.4 J
The flux linked with a coif at any instant t is given by ∅ = 10t² - 50t +The induced emf at t = 35 is:
0%
10 V
0%
190 V
0%
-190 V
0%
-10 V
Explanation
-10 V
Two coils of self inductance 2 mil and 8 mil are placed so close together that the effective flux in one coil is completely linked with other. The mutual inductance between these coils is :
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4 mH
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16 mH
0%
10 mH
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6 mH
Explanation
10 mH
The core of a transformer is laminated because:
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rusting of core may be prevented
0%
ratio of voltage in primary and secondary may be increased.
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energy losses due to eddy current may be minimised
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The weight of transformer may be reduced
Explanation
energy losses due to eddy current may be minimised
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